TC6合金叶片预锻过程中微观组织的数值模拟

Numerical simulation of microstructure evolution during TC6 alloy blade final forging process

根据实验数据建立了TC6钛合金的动态再结晶模型,并对大型模拟软件Deform进行了二次开发,使其具有微观组织预测功能。通过对圆柱体的镦粗模拟验证了Deform软件二次开发后的的可靠性。采用二次开发后的软件,对叶片的预锻成形过程进行了数值模拟,分析了不同变形温度和变形速度对叶片预锻成形时晶粒尺寸及分布的影响。模拟结果表明,随着变形温度的升高,锻件主要变形区的平均晶粒尺寸略有增大,晶粒间晶粒尺寸的差别缩小,晶粒分布比较均匀;随着变形速度的增大,平均晶粒尺寸的分布越来越不均匀。因此,在合适的变形温度及变形速度下能够使锻件获得良好的综合机械性能。

Based on the experimental data,a TC6 titanium alloy model of dynamic recrystallization was established,and in order to have the function to simulate microstructure evolution,a secondary development to large-scale simulation software Deform was carried out.Through a cylinder upsetting simulation,the reliability of the secondary developed software was verified.Preforging process of TC6 titanium alloy blade was simulated under different deformation temperatures and deformation speeds using the secondary developed software.The influence on the grain size and distribution of the different deformation temperatures and deformation rates on the blade during pre-forging was analyzed.Simulation results show that the average grain size of main deformation zone of forging is slightly increased,the difference between grain size is reduced,and the grain distributes evenly as the deformation temperature rising and with the deformation rate increasing,the distribution of average grain size distributes more uneven.Therefore,the appropriate deformation temperature and deformation speed can make forgings with good comprehensive mechanical properties.