Abstract
Hot deformation behavior of Ti-5553 and newly-developed Ti-4733 β-Ti alloys were compared by hot compression tests at 930–1080 °C and strain rates of 0.001–1 s−1. The flow curves and microstructures showed that dynamic recovery and partial continuous dynamic recrystallization are the dominant microstructural mechanisms at hot working condition. It was observed that the flow stress of Ti-4733 lies over that of Ti-5553. Using the M¯d¯-B¯O¯diagram, Mo equivalent number and the valence electron count, it was shown that β-phase in Ti-4733 is more stable than that in Ti-5553. The higher strength of Ti-4733 was attributed to the more stability of β and its higher Mo equivalent number. While the β quenched microstructure in Ti-5553 contained parallel layers of α′ martensite, it was absence in Ti-4733 due to the more stability of β. Using the hyperbolic-sine constitutive equation the values of apparent activation energy for Ti-5553 and Ti-4733 were determined as 380 and 315 kJ/mol, respectively. The Kocks-Mecking dislocation evolution model was used to model the flow curves. The recovery and hardening parameters for Ti-4733 in the developed model were found lower than those for Ti-5553. The model could satisfactorily predict the experimental flow curves at various conditions.
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