TB2钛合金等通道转角挤压变形过程的应变分析及实验研究

Strain analysis and test research of ECAP of TB2 alloy

运用有限元方法对TB2钛合金等温等通道转角挤压过程进行有限元模拟及实验研究。模拟结果表明,材料变形结束后的等效应变分布规律为自下而上应变逐渐减小,平均应变分别为1.46,1.18,1.07。实验结果发现,微观组织得到了明显细化,平均晶粒尺寸为30μm。采用测量显微硬度的方法衡量变形均匀性发现,硬度分布规律与有限元模拟应变分布规律一致,3个部位的平均硬度分别为399.1,396.6,390.5,均大于原始材料的硬度302.4。

With the help of finite element method,the distribution and values of effective strain during the isothermal equal channel angular pressing（ECAP） were studied.The results show that effective strain increases from the bottom to the top of the billet,with the average effective strain value being 1.46,1.18,1.07,respectively;the microstructure is refined and the average grain size is 30μm.The HV hardness measurements and analysis show that its distribution indirectly reflects the deformation of the material,and the average HV hardness of three defined lines from bottom to top of workpiece being 399.1,396.6,390.5,respectively,all higher than the initial hardness.