工业纯钛板材的轧制织构及微观组织对其孪晶和再结晶行为的依赖性

Dependency of Rolling Texture and Microstructure on Twinning and Recrystallization Behavior of CP-Ti Sheet

将工业纯钛(CP-Ti)板轧制至不同程度,随后进行退火以及进行20%的再轧制。通过电子背散射衍射(EBSD)对合金微观组织的变化进行表征。重新轧制后,{1122}<1123> 压缩孪晶和{1012}<1011>拉伸孪晶产生。可以观察到孪晶的层状结构,这是由变形孪晶的缠结以及二次和三次孪晶的产生引起的。平均晶粒尺寸和孪晶量之间没有简单的关联。0.5 h退火样品中的晶粒尺寸随其预变形程度的增加而显著减小。重新轧制倾向于使晶格的重新取向更接近法线方向。虽然织构变化和孪晶体积分数很小,但平行于RD方向的{1010}纤维织构仍然保留。

Commercial pure titanium(CP-Ti) sheets were cold rolled to different amounts, then annealed, and then re-rolled by 20%.Microstructure changes were investigated via electron backscatter diffraction(EBSD). After re-rolling, {1122}<1123> contraction twins and {1012}<1011> extension twins proliferate. A twin lamellas structure can be observed, caused by tangle of deformation twins and the generation of secondary and tertiary twins. There is no simple correlation between the average grain size and the amount of twinning. The grain size significantly decreases with the increase of pre-deformation degree, for 0.5 h annealed sample. Re-rolling tends to re-orient the lattice closer to ND. While the texture change and twin volume fraction are small and the {1010}//RD fiber remains.