Constitutive description of Fe–Mn23–C0.6 steel deformed under hot-working conditions

摘要: As observed from the current literature, vast majority of constitutive models that have been proposed for description changes in high-temperature flow stress high-Mn austenitic steels, course plastic deformation as a function conditions, expressed terms total applied strain to material (e), which, indicated by Follansbee and Kocks, is not valid state parameter. In order overcome this disadvantage, which hinders prediction under transient commonly found during industrial hot-working processes, different proposed. The advanced approach based on temperature rate three important parameters: yield stress, hypothetical saturation actual steady-state considered equal critical onset dynamic recrystallization, Jonas et al. This accomplished means well established Sellars–Tegart–Garofalo model, employing unique value apparent activation energy determined analysis peak values, earlier Glover Sellars. model also requires time achieving 50% conditions simple parametric relationship information subsequently input into two evolution equations, describe change work-hardening work-softening rates material, either when counterbalanced only recovery or it both recrystallization. results reported present communication indicate able provide an accurate reproduction experimental values constant obtained Wietbrock However, schedule conducted suggests second internal variable, other than dislocation density, might be required improvement corresponding stress–strain curves.