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Three-dimensional numerical simulation method for grain growth in directional solidification process of titanium-aluminum alloy

A technology of directional solidification and grain growth, which is applied in the fields of chemical data visualization, instrumentation, computational theoretical chemistry, etc., can solve the problems that the three-dimensional numerical simulation model is not widely used, and achieve the effect of saving manpower and material resources and simplifying the solidification conditions

Pending Publication Date: 2021-07-30
XIAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0005] The establishment of a two-dimensional numerical simulation model for the evolution of the grain structure during the metal solidification process has been quite effective, but the three-dimensional numerical simulation model is not widely used, and the establishment of a three-dimensional model for studying the structure evolution of the metal solidification process can be more intuitive and multi-dimensional. Observation of the evolution of grain structure morphology

Method used

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  • Three-dimensional numerical simulation method for grain growth in directional solidification process of titanium-aluminum alloy
  • Three-dimensional numerical simulation method for grain growth in directional solidification process of titanium-aluminum alloy
  • Three-dimensional numerical simulation method for grain growth in directional solidification process of titanium-aluminum alloy

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Effect test

Embodiment 1

[0097] Input the various thermophysical parameters of the Ti-45%Al alloy in Table 1 into the programmed model of the present invention, and obtain the dendrite growth morphology of the Ti-45%Al alloy at different times through calculation, and the simulation results are as follows image 3 a, 3b shown. It can be seen that when the grains complete nucleation at the nucleation point, due to the specific temperature gradient, the main dendrites of the grains start to grow upwards, and at the same time some secondary dendrites are generated. The secondary dendrites of the grains form a tendency to hinder each other.

Embodiment 2

[0099] Input the thermophysical parameters of Table 1Ti-45%Al alloy in the model programmed by the present invention. Under the condition that other conditions are constant, the dendrite growth morphology when the disturbance amplitude is 0.2 and 2 respectively, the simulation results are as follows Figure 4 a, 4b shown. By comparison, it is found that with the increase of the disturbance amplitude when other conditions remain unchanged, the growth amplitude of the secondary dendrites is coarsened and the growth amplitude also decreases, but the growth spacing of the secondary dendrites does not change significantly.

Embodiment 3

[0101] Input the thermophysical parameters of Table 1Ti-45%Al alloy in the model programmed in the present invention, under the situation that other conditions are constant, the degree of supercooling is respectively 2 and 10 when the dendrite growth morphology simulation, the result Such as Figure 5 a, 5b shown. Through comparison, it can be found that when other conditions remain unchanged, as the degree of supercooling increases, the growth rate of dendrites also increases, and the growth rate of primary dendrites is the fastest. Dendrites grow successively, and the growth advantage of primary dendrites gradually disappears until it is replaced by the growth of secondary dendrites.

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Abstract

The invention discloses a three-dimensional numerical simulation method for grain growth in a directional solidification process of a titanium-aluminum alloy. The three-dimensional numerical simulation method specifically comprises the following steps: simplifying model establishment conditions; establishing a nucleation and growth model; establishing a solute redistribution and diffusion model; defining a capture rule; performing analog computation and result export. The model can simulate a three-dimensional numerical model of nucleation and growth of dendritic crystals in the directional solidification process of the Ti-45% Al alloy, can visually show the growth state of the dendritic crystals from multiple angles, and studies the influence of parameters such as the degree of supercooling and the disturbance amplitude on the growth of the dendritic crystals. Therefore, a certain promotion effect is achieved for researching a dendritic crystal growth mechanism in the directional solidification process of the alloy.

Description

technical field [0001] The invention belongs to the technical field of numerical simulation of metal material casting process, and in particular relates to a three-dimensional numerical simulation method for grain growth in the directional solidification process of titanium-aluminum alloy. Background technique [0002] The evolution of the structure during the solidification of metals has always been a major difficulty in the study of the structure and properties of metal materials. Due to the uncertainty and instantaneousness of the metal solidification process, it is difficult to experimentally study the structure of metal materials. With the continuous development of the computer field and solidification theory, a large number of scholars have focused their attention on the numerical simulation of the microstructure evolution during the metal solidification process with numerical simulation methods and achieved certain results. [0003] So far, the methods that have appe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C10/00G16C20/80G16C60/00
CPCG16C10/00G16C20/80G16C60/00
Inventor 张敏李保铃郭宇飞郭钊
Owner XIAN UNIV OF TECH
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