Constitutive modeling of transition in a micro-alloyed forging steel from static to metadynamic recrystallization
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To obtain the post-recrystallization behaviors of a micro-alloyed forging steel, isothermal interrupted hot compression testswere performed on a Gleeble thermo-mechanical simulator. Double hit schedules were used for compression testing in thefollowing temperature ranges: 1000 ℃-1150 ℃ for deformation, 0.01 s-1-10 s-1 for strain rate, and 0.5 s-20 s for inter-passduration. 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 softeningbehaves differently depending on the imposed pre-strain and becomes strain-independent as the deformation temperaturerises, which suggests that the transition and metadynamic recrystallization are included in the post-recrystallization for thesteel under the deformation conditions above. Then, a model was constituted to predict the kinetics of the transition, whileaccounting for strain-dependence compensation. The assessed outcomes suggest that the proposed constitutive model mayprovide a precise prediction for the kinetics of the transition in the micro-alloyed forging steel.
Abstract
To obtain the post-recrystallization behaviors of a micro-alloyed forging steel, isothermal interrupted hot compression testswere performed on a Gleeble thermo-mechanical simulator. Double hit schedules were used for compression testing in thefollowing temperature ranges: 1000 ℃-1150 ℃ for deformation, 0.01 s-1-10 s-1 for strain rate, and 0.5 s-20 s for inter-passduration. 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 softeningbehaves differently depending on the imposed pre-strain and becomes strain-independent as the deformation temperaturerises, which suggests that the transition and metadynamic recrystallization are included in the post-recrystallization for thesteel under the deformation conditions above. Then, a model was constituted to predict the kinetics of the transition, whileaccounting for strain-dependence compensation. The assessed outcomes suggest that the proposed constitutive model mayprovide a precise prediction for the kinetics of the transition in the micro-alloyed forging steel.
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