Hot deformation behavior and dynamic recrystallization of Ti−3Mo−6Cr−3Al−3Sn titanium alloy Warmverformungsverhalten und dynamische Rekristallisation von Ti−3Mo−6Cr−3Al−3Sn-Titanlegierungen

The hot compression experiments were performed at a deformation temperature of 720 °C to 870 °C and a strain rate of 0.0005 s⁻¹ to 5 s⁻¹. The strain-compensated Arrhenius constitutive equation and the hot processing map at a strain of 0.6 were established, and the dynamic recrystallization behaviors of the alloy in different power dissipation (η) regions were studied. The results show that the correlation coefficient (R) and average relative errors (AARE) of the established constitutive equations are 0.999 % and 2.523 % in the β phase region, and 0.988 % and 7.709 % in the α+β phase region, respectively. The hot processing map shows that the deformation parameters in the high power dissipation regions range from 810 °C to 870 °C/0.0005 s⁻¹ to 0.005 s⁻¹, accompanied by a power dissipation factor of 0.41 to 0.55. These regions result from a combination of continuous and discontinuous recrystallization mechanisms. With the decrease in the power dissipation value, the appearance of deformation bands (DBs) and localized flow (FL) in the microstructure increased.