TC18钛合金等温锻造过程的数值模拟

Research on FEM Numerical Simulation of TC18 Titanium Alloy Forging Process

利用Deform-3D有限元分析软件对TC18钛合金等温锻造过程进行了计算模拟,主要研究变形温度和应变速率等工艺参数对等温变形过程中应变和应力分布的影响。研究发现,变形温度和应变速度对热变形有着重要的影响,700℃、820℃和900℃的有效应变分布具有相似特征,随着变形温度的升高,变形死区逐渐减小,而在820℃双相区变形和900℃的β单相区变形时,其有效应变分布基本相同;随着应变速率的提高,加大了最大主应力的数值并提高了试样中应力梯度,同时试样侧面拉应力的加大,也提高了自由变形拉应力下开裂的倾向。

Deform-3D finite element analysis software was used to simulate the TC18 titanium alloy isothermal forging process,the influence of process parameters such were deformation temperature and strain rate on the distribution of strain and stress during isothermal deformation is studied.The results show that the deformation temperature and strain velocity have important effects on the thermal deformation.The effective strain distributions at 700℃,820℃and 900℃have similar characteristics.The deformation dead zone decreases gradually with the increase of deformation temperature,but the effective strain distributions at 820℃and 900℃are basically the same.With the increase of strain rate,the value of maximum principal stress is increased and the stress gradient in the sample is increased.Meanwhile,the increase of side tensile stress of the sample also increases the tendency of cracking under tensile stress of free deformation.