Ti₂AlNb合金薄壁件成形-热处理过程组织和力学性能预测模型

The prediction model of microstructure and mechanical properties for Ti₂AlNb 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 Ti₂AlNb alloy sheet and the pressing of Ti₂AlNb 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 Ti₂AlNb alloy thin-walled components.