Study on hot deformation and dynamic recrystallization behavior of pure titanium in EB furnace process

Abstract:

The hot deformation behavior of pure titanium in EB furnace process (EB-Ti) with centimeter scale original grain size at different deformation temperature and deformation rate was studied by thermal compression experiment, and the recrystallization mechanism of EB-Ti was discussed based on the electron back scattering diffraction (EBSD) technology. The results show that the hardening behavior of EB-Ti in the process of hot deformation has typical "three-stage" characteristics. In the start stage, the hardening ability is rapid linearly declined; in the middle stage, it rapidly recovers to a peak; in the final stage, it re-declines from the peak. The three-stage phenomenon is related to twinning in the deformation process. EBSD results also show that the recrystallization mechanism of EB-Ti in the process of hot deformation is mainly a discontinuous dynamic recrystallization.

Key words:pure titanium; EB furnace; hot deformation; dynamic recrystallization; mechanism