Metadynamic recrystallizaton behavior of a vanadium-nitrogen microalloyed steel

Abstract

The metadynamic recrystallizaton behavior of a V-N microalloyed steel was studied by performing a two-pass isothermal compression test at 900 °C–1050 °C at a strain rate of 0.1 s⁻¹ to 7 s⁻¹ with the inter-pass time of 0.2–2 s on a Gleeble-3800 thermo-mechanical simulator. The effects of the processing parameters on the metadynamic recrystallizaton behavior of the tested steel were analyzed. The activation energy of the tested steel was determined by regression method and the kinetic models were constructed. Our results showed that the metadynamic recrystallizaton of the tested steel can easily occur due to low activation energy. The effects of the processing parameters are marked and higher deformation temperature, strain rate, or longer time interval contributes to an increase in the metadynamic recrystallized volume fraction. However, it is difficult to observe work hardening in the second pass at a time interval of 0.2 s and stress tends to be steady. Finally, the kinetic models were confirmed by comparing the experimental and the predicted results.