Static recrystallisation kinetics of austenite in Ti, Nb and V microalloyed steels during hot deformation

摘要

Static recrystallisation kinetics during hot deformation of two microalloyed steels (C-Ti-V and C-Ti-Nb) has been quantified. Double hit compression test using a Gleeble 1500 thermomechanical simulator was conducted to determine the recrystallisation kinetics. The kinetics of static recrystallisation was found to be more sluggish in the case of microalloyed steels with niobium additions as compared with other grades of microalloyed steels. The rate of recrystallisation increases with increasing temperature, strain and strain rate. The results are compared with other grades of microalloyed steels, mainly with Ti, Ni and Cu additions, from literature. For niobium containing microalloyed steels, a higher temperature is required for recrystallisation as compared with other microalloyed steels.