A multi-element alloy solid phase change simulation method based on a coupled grain boundary diffusion phase field method

A simulation method and multi-element alloy technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as ignoring grain boundary diffusion, and achieve the effect of optimizing the heat treatment process

Active Publication Date: 2019-05-10
JIANGSU UNIV OF TECH
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Problems solved by technology

[0004] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a simulation method of multi-element alloy solid-state phase transition bas...

Method used

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  • A multi-element alloy solid phase change simulation method based on a coupled grain boundary diffusion phase field method
  • A multi-element alloy solid phase change simulation method based on a coupled grain boundary diffusion phase field method
  • A multi-element alloy solid phase change simulation method based on a coupled grain boundary diffusion phase field method

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example 1

[0089] The multi-component alloy is Ti-6Al-4V alloy, and the phase transformation process from solid phase α to solid phase β is as follows:

[0090] In the process of establishing the quantitative phase field model, the microstructure of Ti-6Al-4V alloy in solid solution state is biequal axis microstructure, so in the free energy G of the system such as formula (1), the energy gradient coefficient Local molar free energy G m is the molar free energy of the solid phase α Molar free energy of solid phase β and the sum of the energy barrier W(η) of the two solid phase free energies of α and β, f(η) is the volume fraction of the solid phase α, and Molar free energy of solid phase α and the molar free energy of the solid phase β Data were obtained from the alloy database with the help of Thermo-Calc software.

[0091] In the KKS model such as formula (2) and formula (3), The kinetic coefficient M of the elements in the grain pi is the linear superposition of kineti...

example 2

[0103] The multi-component alloy is Ti-6Al-4V alloy, and the phase transformation process from solid phase α to solid phase β is as follows:

[0104] In the process of establishing the quantitative phase field model, in order to study the microstructure evolution process of the α sheet in the Ti-6Al-4V alloy, in the free energy G of the system such as formula (1), the energy gradient coefficient Local molar free energy G m is the molar free energy of the solid phase α Molar free energy of solid phase β and the sum of the energy barrier W(η) of the two solid phase free energies of α and β, f(η) is the volume fraction of the solid phase α, and Molar free energy of solid phase α and the molar free energy of the solid phase β Data were obtained from the alloy database with the help of Thermo-Calc software.

[0105] In the KKS model such as formula (2) and formula (3), The kinetic coefficient M of the elements in the grain pi is the linear superposition of kinetic c...

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Abstract

The invention discloses a multi-element alloy solid phase change simulation method based on a coupled grain boundary diffusion phase field method. The multi-element alloy solid phase change simulationmethod comprises the steps of S1, establishing a quantitative phase field model according to the solid phase change process of multi-element alloy; S2, establishing a crystal boundary model; S3, coupling the established grain boundary model into a quantitative phase field model; S4, establishing boundary conditions according to solid-state phase change; S5, establishing a microstructure evolutionmodel, and establishing a microstructure evolution model based on Pittsburg-based on Pittsburg- And establishing a phase field model for simulating solid-state phase change according to a Lamble theory and a Fick-On equation. The method comprises the following steps: establishing a solid-solid phase change model coupled with grain boundary diffusion; The solid-state phase change microstructure evolution process in the multi-element alloy system is quantitatively simulated and predicted, the evolution behavior of the solid-state phase change microstructure can be deeply understood, the solid-state phase change theory is enriched, meanwhile, the heat treatment process is optimized, and guidance can be provided for microstructure evolution research and process optimization.

Description

technical field [0001] The invention belongs to the field of metal phase transformation, in particular to a method for simulating microstructure evolution of multi-element alloy solid state phase transformation based on coupled grain boundary diffusion phase field method. Background technique [0002] During the phase transformation process of the alloy, various microstructures will appear with different conditions, corresponding to different mechanical properties. In order to obtain the ideal microstructure, it is necessary to design a reasonable thermal processing process. Generally speaking, the traditional alloy thermal processing process requires solution treatment at high temperature to eliminate the second phase, homogenize the composition and avoid composition segregation; at the same time, the elimination of the strengthening phase will facilitate the high-temperature deformation of the alloy. The evolution process of microstructure under heat treatment and other pr...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 刘涛杨梅王璐王刚徐东生
Owner JIANGSU UNIV OF TECH
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