Modeling of Dynamic Recrystallization Kinetics of a High Strength Low Alloy Steel During Hot Rolling

A Gleeble thermal–mechanical simulator equipped with an induction heating system was employed to perform single pass compression test to study the dynamic recrystallization behavior of a high-strength low-alloy steel in a wide range of temperatures ( 900℃-1050℃) and strain rates (0.1 s⁻¹-10 s⁻¹). Based on the flow behavior of the tested steel, a new method has been proposed to determine the stress or strain for the onset of dynamic recrystallization. The resultant stresses or strains are compared with the ones determined by using the previous method to confirm the validity of the new method. Moreover, the stress or strain for the onset of dynamic recrystallization is modeled using Zener-Hollomon parameter. With the assistant of the process parameters, temperature, strain and stress, the activation energy has been determined. Finally, the dynamic recrystallization kinetics model is constructed and the validity is tested.