热压缩过程中形变参数对TLM钛合金热变形行为、微观组织和织构演变规律的影响(英文)

Effect of Deformation Parameters on Hot Deformation Behavior, Microstructure and Texture Evolution of TLM Titanium Alloy during Hot Compression

本实验研究了热压缩过程中应变速率和形变量等形变参数对TLM钛合金流变应力行为、微观组织和织构演变规律的影响。实验结果表明:在较高应变速率(≥0.1 s-1)热压缩应力应变曲线出现流动软化;在0.1 s-1应变速率下应力应变曲线呈现明显的振荡;在较低应变速率0.001 s-1应力应变曲线呈现稳态流动。在低应变速率(<0.1 s-1)和大变形量(>10%)条件下,合金不易发生动态再结晶;随着形变量的增大,再结晶晶粒的尺寸逐渐减小。较高的应变速率有利于形成{111}<112>织构。

Effects of the deformation parameters such as strain rates and height reductions on the flow stress behavior, microstructure and texture evolution of TLM titanium alloy were investigated during hot compression. The experimental results show that flow softening occurs at higher strain rate(≥0.1 s-1). Stress-strain curve shows noticeable oscillation at 0.1 s-1 strain rate and the steady-state flow at lower strain rate of 0.001 s-1. At low stain rate(<0.1 s-1) and higher reduction(>10%), dynamic recrystallization scarcely occurs. Moreover, the recrystallized grain size decreases with the increasing of height reduction. Meanwhile, effects of deformation parameters of strain rates on the texture evolution were discussed. The result shows that the higher strain rate is helpful to form the {111}<112> texture.