Recrystallization of commercially pure titanium during and following hot deformation
Commercially available titanium (Grade 2) samples were deformed at high temperatures using a Gleeble 3500 thermo-mechanical simulator. These tests were performed under single hit(hot deformation and quenching) and double hit (hot deformation, un-loading, hot deformation and quenching) processes. The flow stress curves and microstructures of samples were studied after a single or double hit deformation to evaluate dynamic and meta-dynamic recrystallization processes, respectively. The results showed a significant influence of deformation temperature and strain rate on materials behaviour during deformation. Also, an extensive softening on the material observed during double hit deformation tests. The degrees of softening affected by temperature, strain rate and un-loading time. The double hit deformation process showed a significant grain refinement in α phase.