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Three-dimensional numerical simulation method for grain growth of titanium alloy welding pool

A technology for grain growth and welding pool, applied in CAD numerical modeling, electrical digital data processing, special data processing applications, etc., can solve the problem of lack of three-dimensional numerical simulation method of grain growth and so on

Pending Publication Date: 2021-05-11
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a three-dimensional numerical simulation method for grain growth in titanium alloy welding pool, which solves the problem of the lack of three-dimensional numerical simulation method for grain growth in the current titanium alloy welding process

Method used

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  • Three-dimensional numerical simulation method for grain growth of titanium alloy welding pool
  • Three-dimensional numerical simulation method for grain growth of titanium alloy welding pool
  • Three-dimensional numerical simulation method for grain growth of titanium alloy welding pool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] image 3 a and 3b are the three-dimensional simulation results of grain growth in the molten pool during the welding process of TC4 titanium alloy when the welding current is 60A. It can be seen that during the solidification process of the molten pool, grains nucleate at the edge of the molten pool and grow toward the center of the molten pool in the form of columnar crystals. Because the temperature in the molten pool is too high to meet the conditions for grain nucleation, the molten No crystal nuclei are produced in the center of the pool.

Embodiment 2

[0130] Figure 4 a and 4b are the three-dimensional simulation results of grain growth in the molten pool during the welding process of TC4 titanium alloy when the welding current is 70A. It can be seen that because the heat input is larger than that in Example 3, the weldment is completely penetrated, the cross-sectional shape of the weld pool is "trapezoidal", and the upper melting width of the molten pool is larger than the lower melting width. This is because the heat source directly acts on the weldment caused by the surface.

Embodiment 3

[0132] Figure 5 a and 5b are the three-dimensional simulation results of grain growth in the molten pool during the welding process of TA15 titanium alloy at a welding speed of 4 mm / s. It can be seen that with the movement of the welding heat source, the previously melted part gradually solidifies, and the molten pool is still composed of thick columnar crystals. The molten pool in the second half of the weldment is slightly larger than the first half, which is due to the accumulation of heat in the welding process. Caused.

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Abstract

The invention discloses a three-dimensional numerical simulation method for grain growth of a titanium alloy welding pool. The three-dimensional numerical simulation method comprises the following specific steps: step 1, simplifying model conditions; step 2, constructing a welding transient macroscopic temperature field model based on a heat transfer principle; step 3, constructing a microscopic temperature field model based on an interpolation principle; 4, constructing a grain nucleation and growth model; and step 5, analog calculation and result export. The stablished model can simulate the grain growth process of the titanium alloy welding pool on the three-dimensional scale and research the influence of welding process parameters on the size / shape of the welding pool and the dendritic crystal morphology in the welding pool, thereby playing a certain role in promoting the research on the microstructure evolution process of the welding pool in the titanium alloy welding process.

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 three-dimensional numerical simulation method for grain growth in a titanium alloy welding pool. Background technique [0002] With the rapid development of aerospace, marine chemical industry, biomedical and other fields, the requirements for material performance are becoming more and more stringent. Among many metal materials, titanium alloy has low density, high specific strength, high temperature resistance and corrosion resistance. Good sex and other advantages. In the joining process of titanium alloys, welding has the advantages of good connection performance, high structural rigidity, and strong adaptability, and is one of the most important joining processes for titanium alloys. The microstructure of the weld seam has an important influence on its mechanical properties. Welding has the characteristics of ins...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G16C60/00G06F111/10G06F113/26G06F119/08
CPCG06F30/20G16C60/00G06F2111/10G06F2113/26G06F2119/08
Inventor 李继红郭钊郭宇飞李保铃苟川东张敏
Owner XIAN UNIV OF TECH
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