Ti_(2)AlNb合金薄壁件成形-热处理过程组织和力学性能预测模型

Prediction model of microstructure and mechanical properties of forming- heat treatment process for Ti_(2)AlNb alloy thin-walled components

基于内变量法,建立了Ti_(2)AlNb合金成形-热处理过程组织和力学性能预测模型,通过遗传算法求解出该模型的一系列参数,并进行了实验验证。将该模型应用于有限元模拟,实现了成形-热处理过程的微观组织和力学性能全流程一体化模拟。通过该模型对Ti_(2)AlNb合金板材高温自由胀形和管材高温压制进行了模拟,模拟结果与实验结果一致性较好。通过成形-热处理过程组织和性能预测模型可以对构件成形-热处理过程中的变形、微观组织和力学性能进行准确的模拟和预测,指导Ti_(2)AlNb合金薄壁件的成形和热处理工艺的制定。

The prediction model of microstructure and mechanical properties for Ti_(2)AlNb alloy during forming-heat treatment process was established based on internal variable method, and the parameters of model were solved by genetic algorithm and the model was verified by experiments. The model was applied to finite element simulation, and the whole process simulation of microstructure and mechanical properties of forming-heat treatment was realized. The model was used to simulate the free bulging of Ti_(2)AlNb alloy sheet and the pressing of Ti_(2)AlNb alloy pipe at high temperature, and the simulation results are in good agreement with the experiment results. Through the prediction model of microstructure and mechanical properties during hot forming-heat treatment, the deformation, the microstructure and the mechanical properties of components in the process can be accurately simulated and predicted, which can guide the formulation of hot forming and heat treatment process for Ti_(2)AlNb alloy thin-walled components.