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Method for quantitatively analyzing EBSD measured body-centered cubic alloy solidification structure grain sizes

A technology for quantitative analysis and solidification structure, applied in the direction of measuring devices, analyzing materials, and using wave/particle radiation for material analysis, etc., can solve problems such as the inability to evaluate grain size

Inactive Publication Date: 2014-07-02
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0004] The present invention aims to solve the technical problem that the grain size cannot be evaluated when the current EBSD measures the dendrite structure instead of the grain structure, and provides a method for quantitatively analyzing the grain size of the solidified structure of the body-centered cubic alloy measured by EBSD

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  • Method for quantitatively analyzing EBSD measured body-centered cubic alloy solidification structure grain sizes
  • Method for quantitatively analyzing EBSD measured body-centered cubic alloy solidification structure grain sizes
  • Method for quantitatively analyzing EBSD measured body-centered cubic alloy solidification structure grain sizes

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specific Embodiment approach 1

[0024] Embodiment 1: In this embodiment, a method of quantitatively analyzing EBSD to measure the grain size of solidified structure of body-centered cubic alloy is carried out according to the following steps:

[0025] 1. Obtain EBSD data: read the data file output by EBSD after analyzing and testing the surface of body-centered cubic alloys, obtain the space step size (Δx m and Δy m) used in the EBSD measurement process, and obtain the two parameters of each test point. dimensional space coordinates P (x i m, y i meters) and get the three Euler angles for each test point degree, θ i degree and ψ i Spend;

[0026] 2. Create a two-dimensional array: define x described in step 1 i The minimum value of x min 、x i The maximum value is x max 、y i The maximum value is y max and y i The minimum value of y min ;Find four points (x min ,y min ), spatial point (x max ,y max ), spatial point (x max ,y min ) and spatial point (x min ,y max ); establish a two-dimensi...

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Abstract

The invention relates to a method for quantitatively analyzing measured body-centered cubic alloy solidification structure grain sizes, in particular to a method for quantitatively analyzing EBSD measured body-centered cubic alloy solidification structure grain sizes. The purpose is to solve the technical problem that because dendritic structures, not grain structures, are currently measured through EBSD, the grain sizes can not be evaluated. The method includes the steps that step1, EBSD data are obtained; step2, a two-dimensional array is established; step3, a rotation matrix and a growth orientation matrix are established; step4, primary-precipitated phase elements are endowed with attributes; step5, the dendritic structures are evolved as the grain structures; step6, the equivalent diameters of grains are calculated; step7, the average equivalent diameter of the grains in the gravity direction is calculated. The method not only can analyze the grain structures, but also can analyze the dendritic structures, the sizes and distribution characteristics of the grains can be evaluated, and mechanical performance is evaluated with the help of a grain size grade standard. The method is applied to the EBSD measured body-centered cubic alloy solidification structure grain sizes.

Description

technical field [0001] The invention relates to a method for quantitatively analyzing and measuring the grain size of the solidified structure of a body-centered cubic alloy. Background technique [0002] The size of grains formed during the solidification of metal castings has an important influence on the mechanical properties of castings. Compared with coarse grains, fine grains can effectively improve the toughness, shape, hardness and strength of metal castings, weaken intergranular segregation defects, and promote the discrete distribution of shrinkage porosity defects. Therefore, quantitative evaluation of the size of the grain structure during the solidification process of castings not only helps us evaluate the mechanical properties of castings during use, but also serves as a powerful evidence for us to deeply understand the casting process, clarify the solidification principle, and further optimize the casting process. [0003] EBSD (Electron Backscatter Diffract...

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Application Information

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IPC IPC(8): G06F19/00G01N23/203
Inventor 刘东戎曹国剑王丽萍马宝霞冯义成康福伟郭二军
Owner HARBIN UNIV OF SCI & TECH
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