Kinetics of metadynamic recrystallization in microalloyed hypereutectoid steels

Abstract

The isothermal kinetics of the recrystallization processes of vanadium microalloyed high carbon steels has been measured and modelled. The overall softening data were obtained by double hit compression tests performed at temperatures between 900 to 1 050°C, strain rates of 0.01 to 1 s -1, and inter-pass times of 0.1 to 30s. The recrystallization behavior above and below and the critical strain for dynamic recrystallization was investigated, The results show that there is a transition strain region between where both static and metadynamic recrystallization take place during the inter-pass time. The results also revealed that V and Si have a strong solute drag effect, on the kinetics of metadynamic recrystallization. A kinetic model is proposed which takes the V and Si concentrations into account.