To obtain the post-recrystallization behaviors of a micro-alloyed forging steel, isothermal interrupted hot compression tests were performed on a Gleeble thermo-mechanical simulator. Double hit schedules were used for compression testing in the following temperature ranges: 1000 ℃-1150 ℃ for deformation, 0.01 s^-1-10 s^-1 for strain rate, and 0.5 s-20 s for inter-pass duration. To investigate the transition between static and metadynamic recrystallization, three distinct pre-strains (0.32, 0.40, and 0.48) were performed in the initial compression. According to experimental results, the post-recrystallization softening behaves differently depending on the imposed pre-strain and becomes strain-independent as the deformation temperature rises, which suggests that the transition and metadynamic recrystallization are included in the post-recrystallization for the steel under the deformation conditions above. Then, a model was constituted to predict the kinetics of the transition, while accounting for strain-dependence compensation. The assessed outcomes suggest that the proposed constitutive model may provide a precise prediction for the kinetics of the transition in the micro-alloyed forging steel.

Keywords: Post-recrystallization behavior, Pre-strain, Constitutive model, Micro-alloyed forging steel.