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Method for simulating microstructure of aluminum alloy welding pool

A welding pool and microstructure technology, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve problems such as lack of numerical simulation methods, and achieve the effect of saving research costs, accurate and intuitive simulation results

Pending Publication Date: 2021-08-20
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a simulation method for the microstructure of the aluminum alloy welding pool, which solves the problem of the lack of numerical simulation methods in the current research on the welding process of aluminum alloys

Method used

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  • Method for simulating microstructure of aluminum alloy welding pool
  • Method for simulating microstructure of aluminum alloy welding pool
  • Method for simulating microstructure of aluminum alloy welding pool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] image 3 a and 3b are the nucleation and growth process of grains at the edge of the weld pool of 1060 aluminum alloy. It can be seen that when the molten pool begins to solidify, crystal grains nucleate at the edge of the molten pool at first. Since the present invention adopts a continuous nucleation model, a large number of crystal nuclei are randomly generated at the edge of the molten pool under the effect of supercooling, such as image 3 as shown in a. As time goes by, grains begin to grow from the edge of the molten pool to the center of the molten pool. Due to the large temperature gradient at this time, the grains grow rapidly to the center of the molten pool in the form of columnar crystals. nuclear production, such as image 3 as shown in b.

Embodiment 2

[0126] Figure 4 a and 4b are the simulation results of CET (columnar-equiaxed) transformation in the center of the weld pool of 1060 aluminum alloy. It can be seen that with the passage of time and the solidification process of the molten pool, the temperature gradient inside the molten pool gradually decreases, and the temperature in the center of the molten pool meets the requirements for equiaxed crystal nucleation and growth, and CET ( Columnar crystals to equiaxed crystals) transition, and the columnar crystals and equiaxed crystals near the center of the molten pool show a tendency to compete for growth. After the molten pool is completely solidified, the microstructure is composed of columnar crystals at the edge and equiaxed crystals in the center.

Embodiment 3

[0128] Figure 5 a and 5b are the simulation results of the microstructure in the molten pool of 5A06 aluminum alloy under different welding process parameters (heat input). It can be seen that with the decrease of welding heat input, the contour of welding pool will decrease accordingly, which will lead to the reduction of the space for grain growth and the trend of grain refinement, from Figure 5 a and Figure 5 From the comparison of b, it can be seen that the columnar grains and equiaxed grains in the molten pool have been significantly refined. Therefore, in the actual aluminum alloy welding process, the welding heat input should be minimized to achieve the purpose of refining the grain structure under the condition of ensuring the connection quality of the welded components.

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Abstract

The invention discloses a method for simulating a microstructure of an aluminum alloy welding pool. The method comprises the following specific steps: step 1, simplifying model conditions; step2, constructing a macroscopic temperature field model based on a heat transfer principle; step 3, constructing a microscopic temperature field model based on an interpolation principle; step 4, based on a solidification theory, constructing a grain nucleation and growth model; and step 5, carrying out analog calculation and result export. The model can simulate the nucleation and growth process of crystal grains in the aluminum alloy welding process and the CET (columnar crystal-equiaxed crystal) transformation process generated in a molten pool, and can also simulate the influence of welding process parameters and cooling conditions on the morphology of the crystal grains in the molten pool; therefore, a brand-new method is provided for researching the welding process of the aluminum alloy and optimizing the welding process of the aluminum alloy.

Description

technical field [0001] The invention belongs to the technical field of numerical simulation of metal material welding processes, and in particular relates to a simulation method for the microstructure of an aluminum alloy welding molten pool. Background technique [0002] In recent years, with the continuous development of the global industrialization process, the problems of environmental pollution and energy shortage have become increasingly prominent. Under the condition of meeting the use requirements, if light metals can be used instead of heavy metals, the structure can be lightweight and heavy metal pollution can be reduced. Aluminum alloys are widely used in aerospace, transportation, and civil construction due to their advantages such as light weight, low density, high strength, and good processing performance. The processing and manufacturing technology of aluminum alloy is mainly casting, stamping and welding. In actual welding, the welding method of aluminum allo...

Claims

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Application Information

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IPC IPC(8): G16C60/00G06F30/20G06F119/08G06F119/14
CPCG16C60/00G06F30/20G06F2119/08G06F2119/14
Inventor 李继红郭钊郭宇飞李保铃张敏雷龙宇
Owner XIAN UNIV OF TECH
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