Phase field dynamics method for simulating bifurcation growth process of titanium alloy alpha lamella

A growth process, titanium alloy technology, applied in the field of metallurgical casting, can solve problems such as complex bifurcation growth characteristics, and achieve the effect of avoiding limitations, improving and optimizing structure design

Pending Publication Date: 2021-10-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

However, the growth of α-sheet is a dynamic process, and even more complex bifurcation growth characteristics will appear, which is difficult to characterize only by experimental methods

Method used

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  • Phase field dynamics method for simulating bifurcation growth process of titanium alloy alpha lamella
  • Phase field dynamics method for simulating bifurcation growth process of titanium alloy alpha lamella
  • Phase field dynamics method for simulating bifurcation growth process of titanium alloy alpha lamella

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Experimental program
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Embodiment

[0050] Taking Ti-6Al-4V alloy as an example, the phase field dynamics method for simulating the bifurcation growth process of titanium alloy α sheet is:

[0051] (1) Thermodynamics and Equilibrium Components

[0052] First, according to the phase transition temperature of the Ti-6Al-4V alloy, the Gibbs free energy data of the α and β phases at the target temperature were obtained by thermodynamic calculations, and the local free energy densities of the α and β phases of the alloy system were constructed.

[0053] The solution-type local free energy density expression is as follows:

[0054]

[0055] where h(φ)=φ 3 (6φ 2 -15φ+10) is an interpolation function used to connect the free energy curves of the β and α phases; T represents the system temperature in K; c i Indicates the alloy element composition, i=Al and V, the unit is at.%; φ indicates the structural field variable, no unit; and are the equilibrium molar free energies of the α and β phases, unit J / mol, which...

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Abstract

The invention relates to the field of metallurgical casting, in particular to a phase field kinetics method for simulating the bifurcation growth process of a titanium alloy alpha lamella, the method comprises the following steps: S1, acquiring information such as Gibbs free energy density of two phases in the beta-to-alpha solid phase change process of a titanium alloy, balance components of each element in the alloy under different supercooling degrees and the like; s2, constructing an interface energy anisotropy function capable of realizing the bifurcation growth behavior of the titanium alloy alpha lamella; s3, establishing a phase field model, and solving a phase field control equation to obtain a sequence parameter result value; and S4, carrying out visualization processing on the bifurcation growth and evolution result of the titanium alloy alpha lamella, and carrying out experimental verification to clarify the influence rule of the anisotropy of the interface energy on the bifurcation growth behavior of the titanium alloy alpha lamella. According to the method, the alpha lamellar bifurcation growth process during beta-to-alpha transformation of the titanium alloy can be reproduced, and a visual simulation method is provided for the microstructure form and the evolution process of the titanium alloy under the heat treatment process condition.

Description

technical field [0001] The invention relates to the field of metallurgical casting, and relates to a phase field dynamics method for simulating the bifurcation growth process of titanium alloy α sheets. Background technique [0002] Titanium alloy has the advantages of high specific strength, high temperature resistance and corrosion resistance. As a kind of fast-growing structural material, it is widely used in aerospace, navigation and medical fields. The various microstructures of titanium alloys are mainly derived from the thermal-mechanical processing of its deformation and phase transformation coupling. In addition, heat treatment is also a key link to adjust the microstructure and composition. When the alloy cools down from the high-temperature phase region, the α phase precipitates at the grain boundary and grows into the grain in the form of α sheet clusters through interface instability, forming a Widmanstatten structure, which has high tensile strength, good frac...

Claims

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Application Information

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IPC IPC(8): G16C60/00C22F1/18
CPCG16C60/00C22F1/183
Inventor 张金虎许海生雷晓飞董利民杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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