商业纯钛等温热变形的再结晶行为

Recrystallization Behavior of Commercially Pure Titanium during Hot Deformation

利用Gleeble3500热力模拟试验机研究了商业纯钛(Grade 2)高温下的等温热变形行为。纯钛的高温变形中发生的动态再结晶由高温淬火后金相组织的观察及应力-应变曲线所表征。结果表明,变形温度及应变速率对纯钛的变形组织及流变曲线影响较大,同时,也观察到动态软化现象的发生。软化率则主要受变形温度、应变速率影响。与未变形的纯钛组织相比,变形对纯钛的组织有明显的细化作用。

Isothermal hot deformation tests were performed on commercially available titanium （Grade 2） samples at high temperatures using a Gleeble 3500 thermo-mechanical simulator. The flow stress curves and microstructures of the samples were investigated after hot deformation and quenching processes to e- valuate dynamic recrystallization process, respectively. The results show that significant influence of de- formation temperature and strain rate on deformation structure and flow curves can be observed during deformation. Meanwhile, dynamic softening behavior on the material can be observed during hot de- formation tests. The degree of softening Compared with microstructure of pure Ti fined greatly. is related with temperature, strain rate and un-loading time. without deformation, the grain size under deformation is re-fined greatly.