Method and system for evaluating non-uniformity of structure property of welding joint of thick aluminum alloy plate

Abstract

The invention belongs to the technical field of welding. According to the aluminum alloy thick plate welding joint structure property non-uniformity evaluation method and system, a layering critical judgment coefficient is set according to the plate thickness and grain size distribution rule, and division of a thick plate base metal non-uniformity evaluation area is achieved; the division of the non-uniformity evaluation area of the welding joint is realized by combining the division of a base metal evaluation area and the boundary of a welding joint welding seam area, a heat affected area and a base metal area; the microstructures of different evaluation area layers are subjected to characterization analysis, the non-uniformity coefficient of the characteristic values of the microstructures is calculated, and evaluation of the non-uniformity of the microstructures is achieved; the micro-area mechanical properties of different evaluation area layers are tested, the non-uniformity coefficient of the micro-area mechanical properties is calculated, and the non-uniformity evaluation of the micro-area mechanical properties is realized; and according to the non-uniformity evaluation result of the base metal and the welding joint, quantitative evaluation of the non-uniformity degree of the welding joint of the aluminum alloy thick plate is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding, in particular to a method and system for evaluating the unevenness of microstructure and performance of an aluminum alloy thick plate welded joint. BACKGROUND

[0002] Aluminum alloy thick plate material (generally refers to aluminum alloy plate material with a thickness greater than 5mm) has the advantages of high specific strength, high specific modulus, corrosion resistance, etc., and is widely used in high-speed trains, airplanes, etc. However, due to the unevenness of the microstructure of aluminum alloy ingot and the unevenness of rolling deformation, the microstructure and performance of the rolled aluminum alloy thick plate are significantly uneven: the microstructure and performance of different thickness layers are uneven; the microstructure and performance of the plate length direction, the plate width direction, and the plate thickness direction are anisotropic. Moreover, under the action of the uneven temperature field in the welding process, the unevenness of the microstructure and performance of the aluminum alloy thick plate welded joint is further intensified. With the integration and homogenization of structural components such as high-speed trains and airplanes, thick plate materials and welded joints with small anisotropy and uniform high performance are needed. Therefore, it is of great significance to master the unevenness degree of aluminum alloy thick plate material and welded joint for improving the supply quality of aluminum alloy thick plate material, reasonably using aluminum alloy thick plate, and formulating a reasonable thick plate welding process.

[0003] However, in the existing evaluation method of thick plate material and welded joint, the aluminum alloy thick plate material and welded joint are tested as a macroscopic whole, and the difference degree of the microstructure and performance between different thickness layers and in different directions of the thick plate material is not evaluated, so that there is a lack of reasonable basis for selecting aluminum alloy thick plate and formulating a welding process, which leads to the fact that the thick plate welded joint cannot meet the service requirements of the structure, especially for welded components with harsh service conditions and high performance requirements, which may even affect the service safety; in the existing thick plate evaluation method, the evaluation area is simply divided from the thickness layer position, the evaluation area division relies on human experience, and there is a lack of quantitative evaluation method for the unevenness degree, which has problems such as large amount of test, ignoring of key feature information, and inability to quantitatively evaluate. SUMMARY

[0004] In view of the problems in the existing evaluation method of aluminum alloy thick plate material, such as ignoring the unevenness and anisotropy of the thick plate material, lacking scientific basis for layer division of the evaluation area, and lacking calculation method for unevenness evaluation index, etc., the present application provides a method and system for evaluating the unevenness of microstructure and performance of an aluminum alloy thick plate welded joint, which performs hierarchical division based on a layered critical judgment coefficient, evaluates the unevenness of microstructure and performance of the aluminum alloy thick plate material between different thickness layers and in different directions according to the hierarchical division result, and realizes higher precision of unevenness evaluation.

[0005] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme: The first aspect of the present application provides a method for evaluating the unevenness of the microstructure and performance of an aluminum alloy thick plate.

[0006] A method for evaluating the unevenness of the microstructure and performance of an aluminum alloy thick plate comprises the following processes: A critical delamination judgment coefficient of the aluminum alloy thick plate base material is set according to the plate thickness and the grain distribution, and the aluminum alloy thick plate base material is divided into multiple layers from top to bottom according to the critical delamination judgment coefficient. The unevenness of the microstructure of the aluminum alloy thick plate base material is determined according to the average grain size per unit area, the number of second phase particles and the number of precipitated phases of each layer. The unevenness of the micro zone mechanical performance of the aluminum alloy thick plate base material is determined according to the micro zone mechanical performance parameters of each layer. The unevenness evaluation result of the aluminum alloy thick plate base material is determined according to the unevenness of the microstructure and the unevenness of the micro zone mechanical performance.

[0007] In an implementation form of the first aspect of the present application, the grain size variation rate of the different thicknesses relative to the grain size of the plate thickness center region of the aluminum alloy thick plate base material is calculated, and the aluminum alloy thick plate base material is divided into multiple layers from top to bottom according to the size relationship between the variation rate and the critical delamination judgment coefficient.

[0008] In an implementation form of the first aspect of the present application, the weighted sum of the unevenness of the microstructure and the unevenness of the micro zone mechanical performance is taken as the unevenness evaluation result of the aluminum alloy thick plate base material.

[0009] In an implementation form of the first aspect of the present application, the unevenness of the microstructure and the unevenness of the micro zone mechanical performance can also be directly combined as the unevenness evaluation result of the aluminum alloy thick plate base material.

[0010] In an implementation form of the first aspect of the present application, the unevenness of the microstructure includes the grain size unevenness coefficient, the second phase particle number unevenness coefficient and the precipitated phase number unevenness coefficient of the aluminum alloy thick plate base material. The unevenness of the micro zone mechanical performance includes the plate thickness direction micro zone mechanical unevenness coefficient, the plate length direction micro zone mechanical unevenness coefficient and the plate width direction micro zone mechanical unevenness coefficient.

[0011] As a further limitation of the first aspect of the present application, the average grain size and the grain size standard deviation of the aluminum alloy thick plate base material are determined according to the average grain size per unit area of each layer, and the grain size unevenness coefficient of the aluminum alloy thick plate base material is determined according to the ratio of the grain size standard deviation to the average grain size.

[0012] As a further limitation of the first aspect of the application, the average number of second phase particles of the aluminum alloy thick plate base material is determined according to the average number of second phase particles per unit area of each layer, and the standard deviation of the number of second phase particles is determined according to the average number of second phase particles, and the coefficient of non-uniformity of the number of second phase particles of the aluminum alloy thick plate base material is determined according to the ratio of the standard deviation of the number of second phase particles to the average number of second phase particles.

[0013] As a further limitation of the first aspect of the application, the average number of second phase particles of the aluminum alloy thick plate base material is determined according to the average number of second phase particles per unit area of each layer, and the standard deviation of the number of second phase particles is determined according to the average number of second phase particles, and the coefficient of non-uniformity of the number of second phase particles of the aluminum alloy thick plate base material is determined according to the ratio of the standard deviation of the number of second phase particles to the average number of second phase particles.

[0014] As a further limitation of the first aspect of the application, the average number of second phase particles of the aluminum alloy thick plate base material is determined according to the average number of second phase particles per unit area of each layer, and the standard deviation of the number of second phase particles is determined according to the average number of second phase particles, and the coefficient of non-uniformity of the number of second phase particles of the aluminum alloy thick plate base material is determined according to the ratio of the standard deviation of the number of second phase particles to the average number of second phase particles.

[0015] As a further limitation of the first aspect of the application, the average number of second phase particles of the aluminum alloy thick plate base material is determined according to the average number of second phase particles per unit area of each layer, and the standard deviation of the number of second phase particles is determined according to the average number of second phase particles, and the coefficient of non-uniformity of the number of second phase particles of the aluminum alloy thick plate base material is determined according to the ratio of the standard deviation of the number of second phase particles to the average number of second phase particles.

[0016] As a further limitation of the first aspect of the application, the average number of second phase particles of the aluminum alloy thick plate base material is determined according to the average number of second phase particles per unit area of each layer, and the standard deviation of the number of second phase particles is determined according to the average number of second phase particles, and the coefficient of non-uniformity of the number of second phase particles of the aluminum alloy thick plate base material is determined according to the ratio of the standard deviation of the number of second phase particles to the average number of second phase particles.

[0017] In a second aspect, the present application provides a method for evaluating the non-uniformity of the microstructure and performance of an aluminum alloy thick plate welded joint.

[0018] A method for evaluating the non-uniformity of the microstructure and performance of an aluminum alloy thick plate welded joint, comprising the following processes: According to the thickness and grain distribution, the critical layering judgment coefficient of the aluminum alloy thick plate base material is set, and the aluminum alloy thick plate base material is divided into multiple area layers from top to bottom according to the critical layering judgment coefficient; The cross section of the welded joint is divided into base material zone, heat affected zone and weld zone, and the multiple welded joint characteristic regions are determined in combination with the area layers, wherein the heat affected zone and the weld zone correspond to the multiple welded joint characteristic regions respectively; According to the average grain size, the number of second phase particles and the number of precipitated phase in the unit area of each welding joint characteristic area of the heat affected zone, the microstructure non-uniformity evaluation result of the heat affected zone is determined; According to the average grain size, the number of second phase particles and the number of precipitated phase in the unit area of each welding joint characteristic area of the weld zone, the microstructure non-uniformity evaluation result of the weld zone is determined; According to the micro-mechanical property parameters of each welding joint characteristic area of the heat affected zone, the micro-mechanical property non-uniformity evaluation result of the heat affected zone is determined; According to the micro-mechanical property parameters of each welding joint characteristic area of the weld zone, the micro-mechanical property non-uniformity evaluation result of the weld zone is determined; According to the microstructure non-uniformity evaluation result of the heat affected zone, the microstructure non-uniformity evaluation result of the weld zone, the micro-mechanical property non-uniformity evaluation result of the heat affected zone and the micro-mechanical property non-uniformity evaluation result of the weld zone, the welding joint non-uniformity evaluation result is obtained.

[0019] In an implementation form of the second aspect of the present application, the microstructure non-uniformity evaluation result of the heat affected zone comprises: a grain size non-uniformity coefficient of the heat affected zone, a second phase particle number non-uniformity coefficient of the heat affected zone and a precipitated phase number non-uniformity coefficient of the heat affected zone; The microstructure non-uniformity evaluation result of the weld zone comprises: a grain size non-uniformity coefficient of the weld zone, a second phase particle number non-uniformity coefficient of the weld zone and a precipitated phase number non-uniformity coefficient of the weld zone; The micro-mechanical property non-uniformity evaluation result of the heat affected zone comprises: a plate thickness direction micro-mechanical non-uniformity coefficient of the heat affected zone, a plate length direction micro-mechanical non-uniformity coefficient of the heat affected zone and a plate width direction micro-mechanical non-uniformity coefficient of the heat affected zone; The micro-mechanical property non-uniformity evaluation result of the weld zone comprises: a plate thickness direction micro-mechanical non-uniformity coefficient of the weld zone, a plate length direction micro-mechanical non-uniformity coefficient of the weld zone and a plate width direction micro-mechanical non-uniformity coefficient of the weld zone.

[0020] As a further limitation of the second aspect of the present application, according to the average grain size of the unit area of each welding joint characteristic area of the heat affected zone, the average grain size and the grain size standard deviation are determined, and according to the ratio of the grain size standard deviation to the average grain size, the grain size non-uniformity coefficient of the heat affected zone is determined.

[0021] As a further limitation of the second aspect of the present application, the average value of the second phase particle number and the standard deviation of the second phase particle number are determined according to the average value of the second phase particle number per unit area of each weld joint characteristic region of the heat-affected zone, and the second phase particle number unevenness coefficient of the heat-affected zone is determined according to the ratio of the standard deviation of the second phase particle number to the average value of the second phase particle number.

[0022] As a further limitation of the second aspect of the present application, the average value of the second phase particle number and the standard deviation of the second phase particle number are determined according to the average value of the second phase particle number per unit area of each weld joint characteristic region of the heat-affected zone, and the second phase particle number unevenness coefficient of the heat-affected zone is determined according to the ratio of the standard deviation of the second phase particle number to the average value of the second phase particle number.

[0023] As a further limitation of the second aspect of the present application, the average value of the second phase particle number and the standard deviation of the second phase particle number are determined according to the average value of the second phase particle number per unit area of each weld joint characteristic region of the heat-affected zone, and the second phase particle number unevenness coefficient of the heat-affected zone is determined according to the ratio of the standard deviation of the second phase particle number to the average value of the second phase particle number.

[0024] As a further limitation of the second aspect of the present application, the average value of the second phase particle number and the standard deviation of the second phase particle number are determined according to the average value of the second phase particle number per unit area of each weld joint characteristic region of the heat-affected zone, and the second phase particle number unevenness coefficient of the heat-affected zone is determined according to the ratio of the standard deviation of the second phase particle number to the average value of the second phase particle number.

[0025] As a further limitation of the second aspect of the present application, the average value of the second phase particle number and the standard deviation of the second phase particle number are determined according to the average value of the second phase particle number per unit area of each weld joint characteristic region of the heat-affected zone, and the second phase particle number unevenness coefficient of the heat-affected zone is determined according to the ratio of the standard deviation of the second phase particle number to the average value of the second phase particle number.

[0026] As a further limitation of the second aspect of the present application, the average value of the second phase particle number and the standard deviation of the second phase particle number are determined according to the average value of the second phase particle number per unit area of each weld joint characteristic region of the heat-affected zone, and the second phase particle number unevenness coefficient of the heat-affected zone is determined according to the ratio of the standard deviation of the second phase particle number to the average value of the second phase particle number.

[0027] As a further limitation of the second aspect of the present application, the average value of the second phase particle number and the standard deviation of the second phase particle number are determined according to the average value of the second phase particle number per unit area of each weld joint characteristic region of the heat-affected zone, and the second phase particle number unevenness coefficient of the heat-affected zone is determined according to the ratio of the standard deviation of the second phase particle number to the average value of the second phase particle number.

[0028] As a further limitation of the second aspect of the application, the width direction mechanical property mean value and the width direction mechanical property standard deviation are determined according to the width direction micro area mechanical property values of each welding joint characteristic area of the heat affected zone, and the width direction micro area mechanical non-uniformity coefficient of the heat affected zone is determined according to the ratio of the width direction mechanical property standard deviation to the width direction mechanical property mean value.

[0029] As a further limitation of the second aspect of the application, the thickness direction mechanical property mean value and the thickness direction mechanical property standard deviation are determined according to the thickness direction micro area mechanical property values of each welding joint characteristic area of the weld zone, and the thickness direction micro area mechanical non-uniformity coefficient of the weld zone is determined according to the ratio of the thickness direction mechanical property standard deviation to the thickness direction mechanical property mean value.

[0030] As a further limitation of the second aspect of the application, the length direction mechanical property mean value and the length direction mechanical property standard deviation are determined according to the length direction micro area mechanical property values of each welding joint characteristic area of the weld zone, and the length direction micro area mechanical non-uniformity coefficient of the weld zone is determined according to the ratio of the length direction mechanical property standard deviation to the length direction mechanical property mean value.

[0031] As a further limitation of the second aspect of the application, the width direction mechanical property mean value and the width direction mechanical property standard deviation are determined according to the width direction micro area mechanical property values of each welding joint characteristic area of the weld zone, and the width direction micro area mechanical non-uniformity coefficient of the weld zone is determined according to the ratio of the width direction mechanical property standard deviation to the width direction mechanical property mean value.

[0032] In an implementation form of the second aspect of the application, the welding joint non-uniformity evaluation result is determined according to the weighted sum of the microstructure non-uniformity evaluation result of the heat affected zone, the microstructure non-uniformity evaluation result of the weld zone, the micro area mechanical property non-uniformity evaluation result of the heat affected zone, and the micro area mechanical property non-uniformity evaluation result of the weld zone.

[0033] In an implementation form of the second aspect of the application, the microstructure non-uniformity evaluation result of the heat affected zone, the microstructure non-uniformity evaluation result of the weld zone, the micro area mechanical property non-uniformity evaluation result of the heat affected zone, and the micro area mechanical property non-uniformity evaluation result of the weld zone can also be directly combined as the welding joint non-uniformity evaluation result.

[0034] In a third aspect, the application provides an aluminum alloy thick plate welding joint microstructure and performance non-uniformity evaluation method.

[0035] An aluminum alloy thick plate welding joint microstructure and performance non-uniformity evaluation method, comprising the following processes: The unevenness evaluation method of the first aspect of the present application is used to determine the unevenness evaluation result of the aluminum alloy thick plate base material. The unevenness evaluation method of the second aspect of the present application is used to determine the unevenness evaluation result of the welded joint. The final unevenness evaluation result is obtained according to the unevenness evaluation result of the aluminum alloy thick plate base material and the unevenness evaluation result of the welded joint.

[0036] In an implementation form of the third aspect of the present application, the final unevenness evaluation result is obtained according to the weighted sum of the unevenness evaluation result of the aluminum alloy thick plate base material and the unevenness evaluation result of the welded joint.

[0037] In an implementation form of the third aspect of the present application, the final unevenness evaluation result is obtained by directly combining the unevenness evaluation result of the aluminum alloy thick plate base material and the unevenness evaluation result of the welded joint.

[0038] In a fourth aspect, the present application provides an aluminum alloy thick plate microstructure and performance unevenness evaluation system.

[0039] An aluminum alloy thick plate microstructure and performance unevenness evaluation system comprises: The hierarchical division unit is configured to set a layering critical judgment coefficient of the aluminum alloy thick plate base material according to the plate thickness and the grain distribution, and divide the aluminum alloy thick plate base material into multiple layers from top to bottom according to the layering critical judgment coefficient. The microstructure unevenness evaluation unit is configured to determine the microstructure unevenness evaluation result of the aluminum alloy thick plate base material according to the average grain size per unit area, the second phase particle quantity and the precipitated phase quantity of each layer. The micro-region mechanical property unevenness evaluation unit is configured to determine the micro-region mechanical property unevenness evaluation result of the aluminum alloy thick plate base material according to the micro-region mechanical property parameters of each layer. The thick plate base material unevenness evaluation unit is configured to determine the unevenness evaluation result of the aluminum alloy thick plate base material according to the microstructure unevenness evaluation result and the micro-region mechanical property unevenness evaluation result.

[0040] In a fifth aspect, the present application provides an aluminum alloy thick plate welded joint microstructure and performance unevenness evaluation system.

[0041] An aluminum alloy thick plate welded joint microstructure and performance unevenness evaluation system comprises: The hierarchical division unit is configured to set a layering critical judgment coefficient of the aluminum alloy thick plate base material according to the plate thickness and the grain distribution, and divide the aluminum alloy thick plate base material into multiple area layers from top to bottom according to the layering critical judgment coefficient. The welding joint feature region division unit is configured to divide the welding joint section into a base material region, a heat affected zone and a weld region, and determine a plurality of welding joint feature regions in combination with the region layer; The heat affected zone microstructure inhomogeneity evaluation unit is configured to determine a microstructure inhomogeneity evaluation result of the heat affected zone according to the average grain size, the second phase particle number and the precipitate phase number in the unit area of each welding joint feature region of the heat affected zone; The weld region microstructure inhomogeneity evaluation unit is configured to determine a microstructure inhomogeneity evaluation result of the weld region according to the average grain size, the second phase particle number and the precipitate phase number in the unit area of each welding joint feature region of the weld region; The heat affected zone microstructure inhomogeneity evaluation unit is configured to determine a microstructure inhomogeneity evaluation result of the heat affected zone according to the average grain size, the second phase particle number and the precipitate phase number in the unit area of each welding joint feature region of the heat affected zone; The weld region microstructure inhomogeneity evaluation unit is configured to determine a microstructure inhomogeneity evaluation result of the weld region according to the average grain size, the second phase particle number and the precipitate phase number in the unit area of each welding joint feature region of the weld region; The comprehensive evaluation unit is configured to obtain a welding joint inhomogeneity evaluation result according to the microstructure inhomogeneity evaluation result of the heat affected zone, the microstructure inhomogeneity evaluation result of the weld region, the microzone mechanical property inhomogeneity evaluation result of the heat affected zone and the microzone mechanical property inhomogeneity evaluation result of the weld region.

[0042] In a sixth aspect, the present application provides an aluminum alloy thick plate welding joint microstructure and property inhomogeneity evaluation system.

[0043] An aluminum alloy thick plate welding joint microstructure and property inhomogeneity evaluation system comprises: The aluminum alloy thick plate base material inhomogeneity evaluation unit is configured to determine an aluminum alloy thick plate base material inhomogeneity evaluation result by using the inhomogeneity evaluation method of the first aspect of the present application; The welding joint inhomogeneity evaluation unit is configured to determine a welding joint inhomogeneity evaluation result by using the inhomogeneity evaluation method of the second aspect of the present application; The comprehensive evaluation unit is configured to obtain a final inhomogeneity evaluation result according to the aluminum alloy thick plate base material inhomogeneity evaluation result and the welding joint inhomogeneity evaluation result.

[0044] In a seventh aspect, the present application provides a computer device comprising a processor and a computer readable storage medium; The processor is adapted to execute a computer program; A computer readable storage medium, in which a computer program is stored, the computer program, when executed by the processor, implements the unevenness evaluation method according to the first aspect of the present application; or, the unevenness evaluation method according to the second aspect of the present application.

[0045] The beneficial effects of the present application are as follows: 1. The present application innovatively proposes an aluminum alloy thick plate microstructure performance unevenness evaluation method, which divides the evaluation region according to the distribution law of the plate thickness and grain size, and the region division is more reasonable, avoiding the defects in the prior art that the thick plate material is tested as a macroscopic whole or the evaluation region is simply divided from the thickness layer position.

[0046] 2. The present application uses the unevenness coefficient to measure the unevenness of the microstructure performance, realizes the quantitative evaluation of the unevenness degree, overcomes the problem of lack of quantitative evaluation method for the unevenness degree in the prior art, and improves the accuracy of the evaluation.

[0047] 3. The present application can realize the evaluation of the anisotropy unevenness degree between different thickness layers and different directions (plate thickness, plate length, plate width), the evaluation content is more comprehensive, and the problem of ignoring the microstructure performance difference degree between different thickness layers and different directions of the thick plate material in the prior art is avoided.

[0048] 4. The present application obtains the final unevenness evaluation result according to the thick plate base material unevenness evaluation result and the welded joint unevenness evaluation result, provides a reasonable basis for selecting the aluminum alloy thick plate and formulating the welding process, can ensure that the thick plate welded joint meets the structural service requirements, improves the supply quality of the aluminum alloy thick plate material, and has important engineering application value. BRIEF DESCRIPTION OF DRAWINGS

[0049] The drawings accompanying the specification of the present application form a part of the present application and serve to provide further understanding of the present application, the illustrative embodiments of the present application and their descriptions serve to explain the present application, and do not constitute an improper limitation on the present application.

[0050] Figure 1 A schematic diagram of the aluminum alloy thick plate microstructure performance unevenness evaluation method provided for an exemplary embodiment of the present application; Figure 2 A base material unevenness evaluation region division schematic diagram provided for an exemplary embodiment of the present application; Figure 3 A schematic diagram of the aluminum alloy thick plate microstructure performance unevenness evaluation system provided for an exemplary embodiment of the present application; Figure 4 A schematic diagram of the aluminum alloy thick plate welded joint microstructure performance unevenness evaluation method provided for an exemplary embodiment of the present application; Figure 5 A schematic diagram of an aluminum alloy thick plate welded joint microstructure and performance non-uniformity evaluation system provided for an exemplary embodiment of the present application; Figure 6 A schematic diagram of an aluminum alloy thick plate welded joint microstructure and performance non-uniformity evaluation method provided for an exemplary embodiment of the present application; Figure 7 A schematic diagram of an aluminum alloy welded joint non-uniformity evaluation region division provided for an exemplary embodiment of the present application; Figure 8 A schematic diagram of a 7N01 aluminum alloy welded joint non-uniformity evaluation region division provided for an exemplary embodiment of the present application; Figure 9 A 7N01 aluminum alloy welded joint micro area tensile specimen sampling schematic provided for an exemplary embodiment of the present application Figure 1 ; Figure 10 A 7N01 aluminum alloy welded joint micro area tensile specimen sampling schematic provided for an exemplary embodiment of the present application Figure 2 ; Figure 11 A 7N01 aluminum alloy welded joint micro area tensile specimen sampling schematic provided for an exemplary embodiment of the present application Figure 3 ; Figure 12 A schematic diagram of an aluminum alloy thick plate welded joint microstructure and performance non-uniformity evaluation system provided for an exemplary embodiment of the present application; Figure 13 A schematic diagram of a computer device provided for an exemplary embodiment of the present application; 1, HAZ-Z1-plate thickness direction micro tensile specimen; 2, HAZ-Z2-plate thickness direction micro tensile specimen; 3, HAZ-Z3-plate thickness direction micro tensile specimen; 4, WZ-Z1-plate thickness direction micro tensile specimen; 5, WZ-Z2-plate thickness direction micro tensile specimen; 6, WZ-Z3-plate thickness direction micro tensile specimen; 7, HAZ-Z1-plate length direction micro tensile specimen; 8, HAZ-Z2-plate length direction micro tensile specimen; 9, HAZ-Z3-plate length direction micro tensile specimen; 10, WZ-Z1-plate length direction micro tensile specimen; 11, WZ-Z2-plate length direction micro tensile specimen; 12, WZ-Z3-plate length direction micro tensile specimen; 13, HAZ-Z1-plate width direction micro tensile specimen; 14, HAZ-Z2-plate width direction micro tensile specimen; 15, WZ-Z1-plate width direction micro tensile specimen; 16, WZ-Z2-plate width direction micro tensile specimen; 17, WZ-Z3-plate width direction micro tensile specimen; 18, HAZ-Z1-plate width direction micro tensile specimen; 19, weld zone (WZ); 20, heat affected zone (HAZ). DETAILED DESCRIPTION

[0051] It should be noted that the following detailed description is illustrative only, and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0052] As introduced in the background, the existing aluminum alloy thick plate material evaluation method has the problems of ignoring the non-uniformity and anisotropy of the thick plate material, lacking scientific basis for evaluation area layer division, and lacking non-uniformity evaluation index calculation method. In view of this, the present embodiment proposes an aluminum alloy thick plate microstructure and performance non-uniformity evaluation method, including the following processes: S101: setting a layering critical judgment coefficient of the aluminum alloy thick plate base material according to the plate thickness and grain distribution, and dividing the aluminum alloy thick plate base material from top to bottom into multiple layers according to the layering critical judgment coefficient; S102: determining the microstructure non-uniformity evaluation result of the aluminum alloy thick plate base material according to the average grain size per unit area, the second phase particle number, and the precipitate phase number of each layer; S103: determining the micro-region mechanical property non-uniformity evaluation result of the aluminum alloy thick plate base material according to the micro-region mechanical property parameters of each layer; S104: determining the non-uniformity evaluation result of the aluminum alloy thick plate base material according to the microstructure non-uniformity evaluation result and the micro-region mechanical property non-uniformity evaluation result.

[0053] In step S101 of the present embodiment, more specifically, a sample is cut from the cross section of the aluminum alloy thick plate to ensure that the sample covers all thickness regions, and the cross section of the sample is made into a metallographic sample; the grain size at different thicknesses of the cross section is measured, the grain size Dc at the center line region of the plate thickness is taken as a reference, the grain size variation rate A at different thicknesses is calculated, A=(Di-Dc) / Dc, the layering critical judgment coefficient a is set according to the plate thickness and the grain distribution law, the adjacent regions with A≤a are taken as one layer, the adjacent regions with a Figure 2

[0054] In step S102 of the present embodiment, more specifically, the thick plate base material microstructure non-uniformity evaluation includes: based on the determined evaluation regions Z1, Z2…Zi…Zn, respectively making microstructure metallographic samples; characterizing and analyzing the grain size, second phase particles, and precipitate phase morphology of different evaluation region layers to obtain the average grain size per unit area​Z1 , D Z2 … D Zi … D Zn , the number of second phase particles N Z1 , N Z2 … N Zi … N Zn , the number of precipitated phases S Z1 , S Z2 … S Zi … S Zn Then, according to formulas (1)-(3), the non-uniformity coefficients CV 晶粒尺寸 , CV 第二相粒子 , CV 沉淀相 of the grain size, the number of second phase particles, and the number of precipitated phases are calculated, respectively, to realize the evaluation of the microstructure non-uniformity of the thick plate material due to the plate thickness effect.

[0055] (1); (2); (3); wherein, μ represents the average value; represents the standard deviation value, and CV represents the non-uniformity coefficient; Z i代表 different evaluation indexes (grain size, number of second phase particles, number of precipitated phases, mechanical properties, etc.).

[0056] In step S103 of the present implementation mode, more specifically, the thick plate base material microzone mechanical property non-uniformity evaluation is included. Based on the determined evaluation regions Z1, Z2…Zi…Zn, microzone tensile samples in the plate thickness direction, plate length direction, and plate width direction of different evaluation regions are prepared; the microzone tensile samples are subjected to micro-tensile property testing to obtain the microzone mechanical properties of different evaluation regions Z1, Z2…Zi…Zn in the plate thickness direction, plate length direction, and plate width direction; then, according to formulas (1)-(3), the non-uniformity coefficients CV 板厚方向 , CV 板宽方向 , CV 板长方向 of the microzone mechanical properties in the plate thickness direction, plate length direction, and plate width direction are calculated, respectively, to realize the microzone mechanical property non-uniformity evaluation of the thick plate material due to the plate thickness effect.

[0057] In step S104 of the present implementation mode, more specifically, the weighted sum of the microstructure non-uniformity evaluation result and the microzone mechanical property non-uniformity evaluation result is taken as the aluminum alloy thick plate base material non-uniformity evaluation result; or, in some other implementation modes, the microstructure non-uniformity evaluation result and the microzone mechanical property non-uniformity evaluation result are directly combined (for example, presented in a table or directly stored in a database) as the aluminum alloy thick plate base material non-uniformity evaluation result.

[0058] Based on the above aluminum alloy thick plate organization performance unevenness evaluation method, Figure 3 An aluminum alloy thick plate organization performance unevenness evaluation system is shown, comprising: The hierarchical division unit 301 is configured to set the layering critical judgment coefficient of the aluminum alloy thick plate base material according to the plate thickness and grain distribution, and divide the aluminum alloy thick plate base material from top to bottom into multiple layers according to the layering critical judgment coefficient; The microstructure unevenness evaluation unit 302 is configured to determine the microstructure unevenness evaluation result of the aluminum alloy thick plate base material according to the average grain size per unit area, the number of second phase particles, and the number of precipitated phases of each layer; The micro-region mechanical property unevenness evaluation unit 303 is configured to determine the micro-region mechanical property unevenness evaluation result of the aluminum alloy thick plate base material according to the micro-region mechanical property parameters of each layer; The thick plate base material unevenness evaluation unit 304 is configured to determine the thick plate base material unevenness evaluation result according to the microstructure unevenness evaluation result and the micro-region mechanical property unevenness evaluation result.

[0059] As Figure 4 shown, the present implementation also proposes an aluminum alloy thick plate welded joint organization performance unevenness evaluation method, comprising the following processes: S401: Set the layering critical judgment coefficient of the aluminum alloy thick plate base material according to the plate thickness and grain distribution, and divide the aluminum alloy thick plate base material from top to bottom into multiple area layers according to the layering critical judgment coefficient; S402: Divide the welded joint section into base material area, heat affected zone and weld area, and determine multiple welded joint characteristic areas in combination with the area layers, wherein the heat affected zone and the weld area correspond to the multiple welded joint characteristic areas respectively; S403: Determine the microstructure unevenness evaluation result of the heat affected zone according to the average grain size per unit area, the number of second phase particles, and the number of precipitated phases of each welded joint characteristic area of the heat affected zone; S404: Determine the microstructure unevenness evaluation result of the weld area according to the average grain size per unit area, the number of second phase particles, and the number of precipitated phases of each welded joint characteristic area of the weld area; S405: Determine the micro-region mechanical property unevenness evaluation result of the heat affected zone according to the micro-region mechanical property parameters of each welded joint characteristic area of the heat affected zone; S406: Determine the micro-region mechanical property unevenness evaluation result of the weld area according to the micro-region mechanical property parameters of each welded joint characteristic area of the weld area; S407: Obtain a weld joint heterogeneity evaluation result based on the microstructural heterogeneity evaluation result of the heat-affected zone, the microstructural heterogeneity evaluation result of the weld zone, the micromechanical property heterogeneity evaluation result of the heat-affected zone, and the micromechanical property heterogeneity evaluation result of the weld zone.

[0060] The process of step S401 of this implementation is the same as that of step S101 and will not be repeated here.

[0061] In step S402 of this implementation method, specifically, it includes: making a metallographic sample of the weld joint cross section, obtaining the boundaries of the base material area (BM), heat affected zone (HAZ), and weld zone (WZ) in the weld joint after grinding, polishing, and etching, and dividing the weld joint inhomogeneity evaluation area from two aspects: the base material inhomogeneity evaluation area Z1, Z2…Zi…Zn determined in step 1. The weld joint inhomogeneity evaluation area is divided from two aspects: the weld joint characteristic area and the different thickness layer areas. Weld joint characteristic area: the evaluation area located in the heat affected zone is divided into HAZ-Z1, HAZ-Z2…HAZ-Zi…HAZ-Zn, and the evaluation area located in the weld zone is divided into WZ-Z1, WZ-Z2…WZ-Zi…WZ-Zn. Different thickness layer areas: the base material area, heat affected zone, and weld zone located in the same thickness layer area Zi are divided into BM-Zi, HAZ-Zi, and WZ-Zi. The schematic diagram of the division of the inhomogeneity evaluation area of ​​thick plate weld joints is shown as follows: Figure 7 shown.

[0062] In step S403 and step S404 of this implementation, specifically, the following steps are included: preparing microstructure metallographic samples based on the determined weld joint evaluation areas HAZ-Z1, HAZ-Z2 ... HAZ-Zi ... HAZ-Zn and WZ-Z1, WZ-Z2 ... WZ-Zi ... WZ-Zn; characterizing and analyzing the grain size, second phase particles, and precipitate phase morphology of different areas, and obtaining the average grain size per unit area of ​​different evaluation areas in the heat-affected zone Ð HAZ-Z1 , Ð HAZ-Z2 …Ð HAZ-Zi …Ð HAZ-Zn , the number of second phase particles Ñ HAZ-Z1 , Ñ HAZ-Z2 …Ñ HAZ-Zi …Ñ HAZ-Zn , the amount of precipitation phase HAZ-Z1 、 HAZ-Z2 …Š HAZ-Zi …Š HAZ-Zn , and the grain size per unit area in different evaluation areas located in the weld zone Ð WZ-Z1 , Ð WZ-Z2 …Ð WZ-Zi …Ð WZ-Zn , the number of second phase particles Ñ WZ-Z1 , ÑWZ-Z2 WZ-Zi WZ-Zn , the number of precipitated phases WZ-Z1 , the number of precipitated phases WZ-Z2 WZ-Zi WZ-Zn According to formulas (1)-(3), the non-uniformity coefficients CV(HAZ) of the grain size, the second phase particles, and the number of precipitated phases in the heat-affected zone are calculated respectively 晶粒尺寸 , CV(HAZ) 第二相粒子 , CV(HAZ) 沉淀相 ; and the non-uniformity coefficients CV(WZ) of the grain size, the second phase particles, and the number of precipitated phases in the weld zone are calculated respectively 晶粒尺寸 , CV(WZ) 第二相粒子 , CV(WZ) 沉淀相 . Based on the microstructure non-uniformity coefficients of the heat-affected zone and the weld zone, the microstructure non-uniformity evaluation of the welded joint caused by the plate thickness effect is realized; in addition, the microstructure characteristics in the base material zone, the heat-affected zone, and the weld zone in the same thickness layer region Zi are compared, and the microstructure non-uniformity evaluation of the welded joint caused by the welding thermal cycle is realized.

[0063] In steps S405 and S406 of the present embodiment, specifically, the micro zone tensile samples of the heat-affected zone and the weld zone in the plate thickness direction, the plate length direction, and the plate width direction are prepared based on the determined welded joint evaluation regions HAZ-Z1, HAZ-Z2…HAZ-Zi…HAZ-Zn and WZ-Z1, WZ-Z2…WZ-Zi…WZ-Zn; the micro zone tensile samples are tested for micro tensile performance, and the mechanical property data of the different evaluation regions of the heat-affected zone and the weld zone in the plate thickness direction, the plate length direction, and the plate width direction are obtained respectively; according to formulas (1)-(3), the micro zone mechanical property non-uniformity coefficients CV(HAZ) of the heat-affected zone in the plate thickness direction, the plate length direction, and the plate width direction are calculated respectively 板厚方向 , CV(HAZ) 板宽方向 , CV(HAZ) 板长方向 , and the micro zone mechanical property non-uniformity coefficients CV(WZ) of the weld zone in the plate thickness direction, the plate length direction, and the plate width direction are calculated respectively 板厚方向 , CV(WZ) 板宽方向 , CV(WZ) 板长方向 , realizing the micro zone mechanical property non-uniformity evaluation of the welded joint caused by the plate thickness effect. In addition, the micro zone mechanical properties in the base material zone, the heat-affected zone, and the weld zone in the same thickness layer region Zi are compared, and the micro zone mechanical property non-uniformity evaluation of the welded joint caused by the welding thermal cycle is realized.

[0064] ​​​​In step S407 of this implementation, specifically, the welding joint non-uniformity evaluation result is determined according to the weighted sum of the microstructure non-uniformity evaluation result of the heat-affected zone, the microstructure non-uniformity evaluation result of the weld zone, the micro-region mechanical property non-uniformity evaluation result of the heat-affected zone, and the micro-region mechanical property non-uniformity evaluation result of the weld zone; or in other implementations, the microstructure non-uniformity evaluation result of the heat-affected zone, the microstructure non-uniformity evaluation result of the weld zone, the micro-region mechanical property non-uniformity evaluation result of the heat-affected zone, and the micro-region mechanical property non-uniformity evaluation result of the weld zone are directly combined (for example, presented in the form of a table or a database) as the welding joint non-uniformity evaluation result.

[0065] Based on the above-described aluminum alloy thick plate welding joint microstructure and performance non-uniformity evaluation method, Figure 5 An aluminum alloy thick plate welding joint microstructure and performance non-uniformity evaluation system is shown, comprising: The hierarchical division unit 501 is configured to set a layering critical judgment coefficient of the aluminum alloy thick plate base material according to the plate thickness and the grain distribution, and divide the aluminum alloy thick plate base material from top to bottom into a plurality of region layers according to the layering critical judgment coefficient; The welding joint characteristic region division unit 502 is configured to divide the welding joint section into a base material zone, a heat-affected zone, and a weld zone, and determine a plurality of welding joint characteristic regions in combination with the region layers, wherein the heat-affected zone and the weld zone correspond to the plurality of welding joint characteristic regions, respectively; The heat-affected zone microstructure non-uniformity evaluation unit 503 is configured to determine the microstructure non-uniformity evaluation result of the heat-affected zone according to the average grain size per unit area, the number of second phase particles, and the number of precipitated phases of each welding joint characteristic region of the heat-affected zone; The weld zone microstructure non-uniformity evaluation unit 504 is configured to determine the microstructure non-uniformity evaluation result of the weld zone according to the average grain size per unit area, the number of second phase particles, and the number of precipitated phases of each welding joint characteristic region of the weld zone; The micro-region mechanical property non-uniformity evaluation unit 505 is configured to determine the micro-region mechanical property non-uniformity evaluation result of the heat-affected zone according to the micro-region mechanical property parameters of each welding joint characteristic region of the heat-affected zone; The weld zone micro-region mechanical property non-uniformity evaluation unit 506 is configured to determine the micro-region mechanical property non-uniformity evaluation result of the weld zone according to the micro-region mechanical property parameters of each welding joint characteristic region of the weld zone; The comprehensive evaluation unit 507 is configured to obtain the evaluation result of the unevenness of the welded joint according to the evaluation result of the microstructure unevenness of the heat-affected zone, the evaluation result of the microstructure unevenness of the weld zone, the evaluation result of the micro-region mechanical property unevenness of the heat-affected zone, and the evaluation result of the micro-region mechanical property unevenness of the weld zone.

[0066] The present embodiment also provides an evaluation method for unevenness of microstructure and mechanical properties of a welded joint of an aluminum alloy thick plate, as shown in Figure 6 The method comprises the following processes: S601: The unevenness evaluation method of S101-S104 is used to determine the evaluation result of the unevenness of the base material of the aluminum alloy thick plate. S602: The unevenness evaluation method of S401-S407 is used to determine the evaluation result of the unevenness of the welded joint. S603: The final evaluation result of the unevenness is obtained according to the evaluation result of the unevenness of the base material of the aluminum alloy thick plate and the evaluation result of the unevenness of the welded joint.

[0067] In step S603 of the present embodiment, the weighted sum of the evaluation result of the unevenness of the base material of the aluminum alloy thick plate and the evaluation result of the unevenness of the welded joint is taken as the final evaluation result of the unevenness; or in other embodiments, the evaluation result of the unevenness of the base material of the aluminum alloy thick plate and the evaluation result of the unevenness of the welded joint are directly combined (for example, forming a report, a table, or being presented in the form of a database) as the final evaluation result of the unevenness.

[0068] The present application takes the unevenness analysis of a 12mm-thick 7N01 aluminum alloy butt joint as an example, and the implementation process comprises: base material unevenness evaluation region division, base material microstructure unevenness evaluation, base material micro-region mechanical property unevenness evaluation, welded joint unevenness evaluation region division, welded joint microstructure unevenness evaluation, and welded joint micro-region mechanical property unevenness evaluation.

[0069] A metallographic sample block with a size of 12x20x30mm is cut from the cross section of the 7N01 aluminum alloy base material, a plane (T-S plane) perpendicular to the rolling direction (L) of the plate is selected as the observation plane, and the metallographic sample is polished, polished, and anodized after coating. The polarization mode of the optical microscope is used to measure the grain size at different thicknesses. From the top surface of the sample, the grain size of each 1mm thick layer is: 40μm, 42μm, 48μm, 50μm, 53μm, 62μm, 65μm, 59μm, 55μm, 49μm, 42μm, 40μm, 39μm, and the grain size at the center line of the plate thickness (6mm from the top surface) is 65μm as the reference Dc, and the grain size variation rate A at different thicknesses is calculated according to the formula A= (Di-Dc) / Dc: 38%, 35%, 26%, 23%, 18%, 5%, 0%, 9%, 15%, 25%, 35%, 38%, 40%. Considering that the plate thickness is 12mm, combined with the grain size variation rate at different thicknesses, the stratified critical judgment coefficient a is set to 20%, and the area where A≤20% is regarded as a layer, and the area where 20%<A≤40% is regarded as another layer. Therefore, the base material evaluation area is divided into 3 layers: the area of 0~3mm is the evaluation area Z1; the area of 4~8mm is the evaluation area Z2; and the area of 9~12mm is the evaluation area Z3; Based on the determined evaluation areas Z1, Z2, and Z3, microstructure metallographic samples of Z1, Z2, and Z3 are prepared, and the average grain size per unit area in different area layers is analyzed and counted by electron backscatter diffraction (EBSD) Z1 , Z2 , Z3 ; the number of second phase particles per unit area in different areas is analyzed and counted by scanning electron microscope (SEM) Z1 , Z2 , Z3 ; the number of precipitated phases per unit area in different areas is analyzed and counted by scanning electron microscope (TEM) Z1 , Z2 , Z3 . According to the calculation formulas (1)-(3), the non-uniformity coefficients CV 晶粒尺寸 , CV 第二相粒子 , CV 沉淀相 of grain size, second phase particles, and precipitated phase number are calculated respectively, to realize the microstructure non-uniformity evaluation of thick plate material caused by plate thickness effect, as shown in Table 1.

[0070] Table 1: Microstructure non-uniformity evaluation of base material.

[0071]

[0072] Based on the determined evaluation regions Z1, Z2, Z3, micro tensile specimens of different regions in the plate thickness direction, plate length direction and plate width direction are respectively prepared; micro tensile performance test is performed on the micro tensile specimens, and the tensile strength of Z1, Z2, Z3 in the plate thickness direction is respectively σ Z1-板厚方向 , σ Z2-板厚方向 , σ Z3-板厚方向 , the tensile strength of Z1, Z2, Z3 in the plate length direction is respectively σ Z1-板长方向 , σ Z2-板长方向 , σ Z3-板长方向 , and the test results of Z1, Z2, Z3 in the plate width direction are respectively σ Z1-板宽方向 , σ Z2-板宽方向 , σ Z3-板宽方向 . According to the calculation formulas (1)-(3), the micro mechanical property unevenness coefficients CV 板厚方向 , CV 板宽方向 , CV 板长方向 in the plate thickness direction, plate length direction and plate width direction are respectively calculated, so as to realize the micro mechanical property unevenness evaluation of the thick plate material due to the plate thickness effect, as shown in Table 2.

[0073] Table 2: Micro mechanical property unevenness evaluation of base material

[0074]

[0075] The metallographic specimen of the welded joint section is prepared, and after polishing, polishing and etching, the boundaries of the base material area (BM), the heat affected zone (HAZ) and the weld zone (WZ) in the welded joint are obtained. Combined with the evaluation regions Z1, Z2, Z3 determined in step 1, the heat affected zone of the welded joint is divided into HAZ-Z1, HAZ-Z2 and HAZ-Z3, and the weld zone is divided into WZ-Z1, WZ-Z2 and WZ-Z3, so as to complete the division of the uneven evaluation region of the welded joint, and the unevenness evaluation region division diagram of the 7N01 aluminum alloy welded joint is shown in Figure 8 .

[0076] Based on the determined evaluation regions HAZ-Z1, HAZ-Z2, HAZ-Z3 and WZ-Z1, WZ-Z2, WZ-Z3 of the welded joint, the metallographic structure specimens of the evaluation regions of the heat affected zone and the weld zone are respectively prepared, as shown in Figure 9 , Figure 10 and Figure 11The shown, including: HAZ-Z1-plate thickness direction micro tensile specimen 1, HAZ-Z2-plate thickness direction micro tensile specimen 2, HAZ-Z3-plate thickness direction micro tensile specimen 3, WZ-Z1-plate thickness direction micro tensile specimen 4, WZ-Z2-plate thickness direction micro tensile specimen 5, WZ-Z3-plate thickness direction micro tensile specimen 6, HAZ-Z1-plate length direction micro tensile specimen 7, HAZ-Z2-plate length direction micro tensile specimen 8, HAZ-Z3-plate length direction micro tensile specimen 9, WZ-Z1-plate length direction micro tensile specimen 10, WZ-Z2-plate length direction micro tensile specimen 11, WZ-Z3-plate length direction micro tensile specimen 12, HAZ-Z1-plate width direction micro tensile specimen 13, HAZ-Z2-plate width direction micro tensile specimen 14, WZ-Z1-plate width direction micro tensile specimen 15, WZ-Z2-plate width direction micro tensile specimen 16, WZ-Z3-plate width direction micro tensile specimen 17, HAZ-Z1-plate width direction micro tensile specimen 18, weld zone (WZ) 19 and heat affected zone (HAZ) 20. The grain size in different evaluation area per unit area located in the heat affected zone is analyzed by electron backscatter diffraction (EBSD) HAZ-Z1 , and the average value of the grain size in different evaluation area per unit area located in the weld zone HAZ-Z2 , and the average value of the grain size in different evaluation area per unit area located in the weld zone HAZ-Z3 , and the average value of the grain size in different evaluation area per unit area located in the weld zone WZ-Z1 , and the average value of the grain size in different evaluation area per unit area located in the weld zone WZ-Z2 , and the average value of the grain size in different evaluation area per unit area located in the weld zone WZ-Z3 ; the number of second phase particles in different evaluation area per unit area located in the heat affected zone is observed and analyzed by scanning electron microscope (SEM) HAZ-Z1 , and the number of second phase particles in different evaluation area per unit area located in the weld zone HAZ-Z2 , and the number of second phase particles in different evaluation area per unit area located in the weld zone HAZ-Z3 , and the number of second phase particles in different evaluation area per unit area located in the weld zone WZ-Z1 , and the number of second phase particles in different evaluation area per unit area located in the weld zone WZ-Z2 , and the number of second phase particles in different evaluation area per unit area located in the weld zone WZ-Z3 ; the number of precipitated phase in different evaluation area per unit area located in the heat affected zone is observed and analyzed by scanning electron microscope (TEM) HAZ-Z1 , and the number of precipitated phase in different evaluation area per unit area located in the weld zone HAZ-Z2 , and the number of precipitated phase in different evaluation area per unit area located in the weld zone HAZ-Z3 , and the number of precipitated phase in different evaluation area per unit area located in the weld zone WZ-Z1 , and the number of precipitated phase in different evaluation area per unit area located in the weld zone WZ-Z2 , and the number of precipitated phase in different evaluation area per unit area located in the weld zone WZ-Z3 . According to the calculation formula (1)-(3), the non-uniformity coefficient CV HAZ-晶粒尺寸 , CV HAZ-第二相粒子 , CV HAZ-沉淀相 of the grain size, the number of second phase particles and the number of precipitated phase in the heat affected zone are calculated respectively; in the same way, the non-uniformity coefficient CV WZ-晶粒尺寸 , CV WZ-第二相粒子 , CV WZ-沉淀相Based on the microstructure inhomogeneity coefficient of the heat-affected zone and the weld zone, the microstructure inhomogeneity evaluation of the welded joint due to the plate thickness effect is realized. In addition, by comparing the microstructure characteristics of the base material zone, the heat-affected zone and the weld zone in the same thickness layer region Zi, the microstructure inhomogeneity evaluation of the welded joint due to the welding thermal cycle is realized, as shown in Table 3.

[0077] Table 3: Microstructure inhomogeneity evaluation of 7N01 aluminum alloy welded joint.

[0078]

[0079] Based on the divided evaluation regions of the welded joint, HAZ-Z1, HAZ-Z2, HAZ-Z3 and WZ-Z1, WZ-Z2, WZ-Z3, micro tensile specimens in different evaluation regions in the plate thickness direction, the plate length direction and the plate width direction are prepared. Through micro tensile property test, the micro mechanical property data of different evaluation regions in the plate thickness direction, the plate length direction and the plate width direction are obtained, as shown in Table 4. According to formulas (1)-(3), the micro mechanical property inhomogeneity coefficients CV HAZ-板厚方向 , CV HAZ-板长方向 , CV HAZ-板宽方向 , CV WZ-板厚方向 , CV WZ-板长方向 and CV WZ-板宽方向 in the plate thickness direction, the plate length direction and the plate width direction are calculated, respectively, to realize the micro mechanical property inhomogeneity evaluation of the welded joint due to the plate thickness effect. In addition, combined with the micro mechanical property inhomogeneity coefficient of the base material in Table 2, the micro mechanical property comparison of the base material zone, the heat-affected zone and the weld zone in the same thickness layer region is obtained, to realize the micro mechanical property inhomogeneity evaluation of the welded joint due to the welding thermal cycle, as shown in Table 4.

[0080] Table 4: Micro mechanical property inhomogeneity evaluation of the welded joint.

[0081]

[0082] In the present embodiment, combined with the inhomogeneity evaluation results of the aluminum alloy thick plate base material and the welded joint, an aluminum alloy thick plate welded joint microstructure and property inhomogeneity evaluation report is formed, which can directly present Tables 1-4, or can obtain a final inhomogeneity coefficient as a comprehensive evaluation in a weighted summation manner, which is not described here.

[0083] Figure 12 An aluminum alloy thick plate welded joint microstructure and property inhomogeneity evaluation system is proposed, which comprises: The aluminum alloy thick plate base material inhomogeneity evaluation unit 1201 is configured to determine the aluminum alloy thick plate base material inhomogeneity evaluation result by using the inhomogeneity evaluation method described in steps S101-S104. The welding joint unevenness evaluation unit 1202 is configured to determine the welding joint unevenness evaluation result by using the unevenness evaluation method described in steps S401-S407. The comprehensive evaluation unit 1203 is configured to obtain the final unevenness evaluation result according to the aluminum alloy thick plate base material unevenness evaluation result and the welding joint unevenness evaluation result.

[0084] Figure 13 A computer device is shown, which includes a processor 1301, a communication interface 1302, and a computer readable storage medium 1303. The processor 1301, the communication interface 1302, and the computer readable storage medium 1303 can be connected through a bus or other means.

[0085] The communication interface 1302 is configured to receive and send data, the computer readable storage medium 1303 can be stored in the memory of the electronic device, the computer readable storage medium 1303 is configured to store a computer program, the computer program includes program instructions, and the processor 1301 is configured to execute the program instructions stored in the computer readable storage medium 1303.

[0086] The processor 1301 is the computing core and control core of the electronic device, which is suitable for implementing one or more instructions, and is particularly suitable for loading and executing one or more instructions to implement a corresponding method flow or a corresponding function.

[0087] The processor 1301 is configured to execute the process of the aluminum alloy thick plate microstructure performance unevenness evaluation method or the aluminum alloy thick plate welding joint microstructure performance unevenness evaluation method described above.

[0088] Those of ordinary skill in the art can be aware that, in combination with the examples described in the embodiments disclosed in this application, each unit and algorithm step of the examples can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those of ordinary skill in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0089] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions according to the embodiments of the present application are generated. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in or transmitted by a computer readable storage medium. The computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through a wired (for example, coaxial cable, optical fiber, digital line) or wireless (for example, infrared, wireless, microwave, etc.) manner. The computer readable storage medium can be any available medium that can be accessed by a computer or a data processing device such as a server, data center, etc. integrated with one or more available media. The available media can be magnetic media (for example, floppy disk, hard disk, magnetic tape), optical media (for example, DVD), or semiconductor media (for example, solid state disk) and the like.

[0090] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for evaluating the heterogeneity of microstructure and properties of aluminum alloy thick plates, characterized in that: The following processes are included: The critical delamination determination coefficient of the aluminum alloy thick plate base material is set according to the plate thickness and grain distribution, and the aluminum alloy thick plate base material is divided into multiple layers from top to bottom according to the critical delamination determination coefficient; The microstructural heterogeneity evaluation results of the aluminum alloy thick plate base material are determined based on the average grain size per unit area of ​​each layer, the number of second phase particles, and the number of precipitated phases. According to the micro-area mechanical property parameters of each layer, the micro-area mechanical property heterogeneity evaluation results of the aluminum alloy thick plate base material are determined; The evaluation results of the heterogeneity of the aluminum alloy thick plate base material are determined based on the evaluation results of the microstructure heterogeneity and the micro-area mechanical property heterogeneity.

2. The method for evaluating the heterogeneity of microstructure and properties of an aluminum alloy thick plate according to claim 1, wherein: Taking the grain size of the center region of the thick aluminum alloy plate as a benchmark, the change rate of the grain size at different thicknesses and the grain size in the center region of the plate thickness is calculated. Based on the relationship between the change rate and the critical determination coefficient of delamination, the thick aluminum alloy plate is divided into multiple layers from top to bottom. Alternatively, the weighted sum of the microstructure heterogeneity evaluation results and the micro-region mechanical property heterogeneity evaluation results is used as the aluminum alloy thick plate base material heterogeneity evaluation result; Alternatively, the microstructure heterogeneity evaluation result and the micro-area mechanical property heterogeneity evaluation result are directly combined as the aluminum alloy thick plate base material heterogeneity evaluation result.

3. The method for evaluating the heterogeneity of microstructure and properties of an aluminum alloy thick plate according to claim 1, wherein: The microstructure heterogeneity evaluation results include: the grain size heterogeneity coefficient, the second phase particle quantity heterogeneity coefficient and the precipitation phase quantity heterogeneity coefficient of the aluminum alloy thick plate base material; The micro-area mechanical property non-uniformity evaluation result includes: a micro-area mechanical non-uniformity coefficient in the plate thickness direction, a micro-area mechanical non-uniformity coefficient in the plate length direction, and a micro-area mechanical non-uniformity coefficient in the plate width direction.

4. The method for evaluating the heterogeneity of microstructure and properties of an aluminum alloy thick plate according to claim 3, wherein: The grain size non-uniformity coefficient, the second phase particle number non-uniformity coefficient and the precipitate number non-uniformity coefficient of the aluminum alloy thick plate base material are determined according to the average grain size per unit area, the average number of second phase particles and the average number of precipitate phases in each layer respectively; The micro-area mechanical nonuniformity coefficients of the aluminum alloy thick plate base material in the plate thickness direction, plate length direction and plate width direction are determined according to the micro-area mechanical property values ​​in the thickness direction, length direction and width direction of each layer respectively.

5. A method for evaluating the heterogeneity of microstructure and properties of aluminum alloy thick plate welded joints, characterized in that: The following processes are included: The critical delamination determination coefficient of the aluminum alloy thick plate base material is set according to the plate thickness and grain distribution, and the aluminum alloy thick plate base material is divided into multiple regional layers from top to bottom according to the critical delamination determination coefficient; The weld joint cross section is divided into the base metal area, the heat-affected zone and the weld area, and multiple weld joint characteristic areas are determined by combining the regional layers, wherein the heat-affected zone and the weld area correspond to multiple weld joint characteristic areas respectively; The microstructural heterogeneity evaluation results of the heat-affected zone are determined based on the average grain size, the number of second phase particles, and the number of precipitated phases per unit area of ​​each characteristic area of ​​the heat-affected zone; The evaluation results of microstructural heterogeneity of the weld zone are determined based on the average grain size, number of second phase particles and number of precipitated phases per unit area of ​​each characteristic area of ​​the weld joint; Determine the micro-area mechanical property heterogeneity evaluation results of the heat-affected zone based on the micro-area mechanical property parameters of each characteristic area of ​​the weld joint in the heat-affected zone; Determine the micro-region mechanical property heterogeneity evaluation results of the weld zone based on the micro-region mechanical property parameters of each weld joint characteristic region in the weld zone; The weld joint heterogeneity evaluation results are obtained based on the microstructural heterogeneity evaluation results of the heat-affected zone, the microstructural heterogeneity evaluation results of the weld zone, the micro-area mechanical property heterogeneity evaluation results of the heat-affected zone, and the micro-area mechanical property heterogeneity evaluation results of the weld zone.

6. The method for evaluating the heterogeneity of microstructure and properties of aluminum alloy thick plate welded joints according to claim 5, wherein: The evaluation results of the microstructural heterogeneity of the heat-affected zone include: the grain size heterogeneity coefficient of the heat-affected zone, the number heterogeneity coefficient of the second phase particles in the heat-affected zone, and the number heterogeneity coefficient of the precipitated phase in the heat-affected zone; The evaluation results of the microstructural heterogeneity of the weld area include: the grain size heterogeneity coefficient of the weld area, the second phase particle quantity heterogeneity coefficient of the weld area, and the precipitation phase quantity heterogeneity coefficient of the weld area; The evaluation results of the micro-area mechanical property non-uniformity of the heat-affected zone include: the micro-area mechanical non-uniformity coefficient of the heat-affected zone in the plate thickness direction, the micro-area mechanical non-uniformity coefficient of the heat-affected zone in the plate length direction, and the micro-area mechanical non-uniformity coefficient of the heat-affected zone in the plate width direction; The evaluation results of the micro-area mechanical property inhomogeneity of the weld zone include: the micro-area mechanical inhomogeneity coefficient of the weld zone in the plate thickness direction, the micro-area mechanical inhomogeneity coefficient of the weld zone in the plate length direction, and the micro-area mechanical inhomogeneity coefficient of the weld zone in the plate width direction.

7. The method for evaluating the heterogeneity of microstructure and properties of aluminum alloy thick plate welded joints according to claim 6, wherein: The grain size non-uniformity coefficient, the second phase particle number non-uniformity coefficient and the precipitate number non-uniformity coefficient of the heat-affected zone are determined based on the average grain size per unit area, the average number of second phase particles and the average number of precipitate phase in the characteristic area of ​​each weld joint in the heat-affected zone; Alternatively, the grain size non-uniformity coefficient, the second phase particle number non-uniformity coefficient, and the precipitate number non-uniformity coefficient of the weld zone are determined based on the average grain size per unit area, the average number of second phase particles, and the average number of precipitate phases in the characteristic regions of each welded joint in the weld zone; Alternatively, the micro-region mechanical non-uniformity coefficients in the thickness direction, length direction and width direction of the heat-affected zone are determined based on the micro-region mechanical property values ​​in the thickness direction, length direction and width direction of each characteristic area of ​​the weld joint in the heat-affected zone; Alternatively, the micro-region mechanical non-uniformity coefficients in the plate thickness direction, plate length direction and plate width direction of the weld zone are determined based on the micro-region mechanical property values ​​in the thickness direction, length direction and width direction of each weld joint characteristic area in the weld zone.

8. The method for evaluating the heterogeneity of microstructure and properties of aluminum alloy thick plate welded joints according to claim 6, wherein: Determine the weld joint heterogeneity evaluation result based on the weighted sum of the microstructure heterogeneity evaluation result of the heat-affected zone, the microstructure heterogeneity evaluation result of the weld zone, the micro-region mechanical property heterogeneity evaluation result of the heat-affected zone, and the micro-region mechanical property heterogeneity evaluation result of the weld zone; Alternatively, the microstructural heterogeneity evaluation results of the heat-affected zone, the microstructural heterogeneity evaluation results of the weld zone, the micro-area mechanical property heterogeneity evaluation results of the heat-affected zone, and the micro-area mechanical property heterogeneity evaluation results of the weld zone are directly combined as the weld joint heterogeneity evaluation result.

9. A method for evaluating the heterogeneity of microstructure and properties of aluminum alloy thick plate welded joints, characterized in that: The following processes are included: Determine the unevenness evaluation result of the aluminum alloy thick plate base material by using the unevenness evaluation method according to any one of claims 1 to 4; Determine the weld joint unevenness evaluation result by using the unevenness evaluation method according to any one of claims 5 to 8; The final unevenness evaluation result is obtained based on the unevenness evaluation results of the aluminum alloy thick plate base material and the unevenness evaluation results of the weld joint.

10. The method for evaluating the heterogeneity of microstructure and properties of aluminum alloy thick plate welded joints according to claim 9, wherein: The final unevenness evaluation result is obtained by taking the weighted sum of the unevenness evaluation results of the aluminum alloy thick plate base material and the unevenness evaluation results of the weld joint; Alternatively, the aluminum alloy thick plate base material non-uniformity evaluation result and the weld joint non-uniformity evaluation result are directly combined as the final non-uniformity evaluation result.

11. A system for evaluating the heterogeneity of microstructure and properties of aluminum alloy thick plates, characterized in that: include: The layer division unit is configured to: set a critical delamination determination coefficient of the aluminum alloy thick plate base material according to the plate thickness and grain distribution, and divide the aluminum alloy thick plate base material into a plurality of layers from top to bottom according to the critical delamination determination coefficient; The microstructure heterogeneity evaluation unit is configured to: determine a microstructure heterogeneity evaluation result of the aluminum alloy thick plate base material based on an average grain size per unit area of ​​each layer, a number of second phase particles, and a number of precipitated phases; The micro-area mechanical property heterogeneity evaluation unit is configured to: determine the micro-area mechanical property heterogeneity evaluation result of the aluminum alloy thick plate base material according to the micro-area mechanical property parameters of each layer; The thick plate base material inhomogeneity evaluation unit is configured to determine an aluminum alloy thick plate base material inhomogeneity evaluation result according to a microstructure inhomogeneity evaluation result and a micro-region mechanical property inhomogeneity evaluation result.

12. A system for evaluating the heterogeneity of microstructure and properties of aluminum alloy thick plate welded joints, characterized in that: include: The hierarchical division unit is configured to: set a critical delamination determination coefficient of the aluminum alloy thick plate base material according to the plate thickness and grain distribution, and divide the aluminum alloy thick plate base material into a plurality of regional layers from top to bottom according to the critical delamination determination coefficient; a weld joint characteristic region division unit configured to: divide the weld joint cross section into a base metal region, a heat-affected zone, and a weld region, and determine a plurality of weld joint characteristic regions in combination with the region layer, wherein the heat-affected zone and the weld region respectively correspond to a plurality of weld joint characteristic regions; a heat-affected zone microstructure heterogeneity evaluation unit configured to: determine a heat-affected zone microstructure heterogeneity evaluation result based on an average grain size per unit area, a number of second phase particles, and a number of precipitated phases in characteristic regions of each weld joint in the heat-affected zone; The weld zone microstructure heterogeneity evaluation unit is configured to: determine a microstructure heterogeneity evaluation result of the weld zone according to an average grain size per unit area, a number of second phase particles, and a number of precipitated phases in each characteristic region of the weld joint; The micro-area mechanical property heterogeneity evaluation unit is configured to: determine a micro-area mechanical property heterogeneity evaluation result of the heat-affected zone according to the micro-area mechanical property parameters of each characteristic area of ​​the weld joint in the heat-affected zone; The weld zone micro-area mechanical property heterogeneity evaluation unit is configured to: determine a micro-area mechanical property heterogeneity evaluation result of the weld zone according to the micro-area mechanical property parameters of each weld joint characteristic area in the weld zone; The comprehensive evaluation unit is configured to obtain a welding joint heterogeneity evaluation result based on a microstructural heterogeneity evaluation result of the heat-affected zone, a microstructural heterogeneity evaluation result of the weld zone, a micro-area mechanical property heterogeneity evaluation result of the heat-affected zone, and a micro-area mechanical property heterogeneity evaluation result of the weld zone.

13. A system for evaluating the heterogeneity of microstructure and properties of aluminum alloy thick plate welded joints, characterized in that: include: An aluminum alloy thick plate base material non-uniformity evaluation unit is configured to: determine an aluminum alloy thick plate base material non-uniformity evaluation result using the non-uniformity evaluation method according to any one of claims 1 to 4; The welding joint non-uniformity evaluation unit is configured to: determine a welding joint non-uniformity evaluation result by using the non-uniformity evaluation method according to any one of claims 5 to 8; The comprehensive evaluation unit is configured to obtain a final unevenness evaluation result based on the unevenness evaluation result of the aluminum alloy thick plate base material and the unevenness evaluation result of the weld joint.

14. A computer device, characterized in that: include: a processor and a computer-readable storage medium; a processor adapted to execute a computer program; A computer-readable storage medium having a computer program stored therein, wherein when the computer program is executed by the processor, the computer program implements the non-uniformity evaluation method according to any one of claims 1 to 4; or implements the non-uniformity evaluation method according to any one of claims 5 to 8.

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