Constitutive modelling of hot deformation behaviour of metallic materials

The complexity of hot deformation behaviours metallic materials is acknowledged in decades study. present work uses a new constitutive model by Zhu-Ou-Popov (ZOP model) and its modifications to predict the metals. ZOP are introduced firstly. basic idea these models centred on set piecewise transition functions: functions used flow stress at different strain ranges, whilst enable smooth shifting from small large ranges. methods for identification four variant developed given detail. Hot compressive curves 42CrMo rates temperatures show validity models. Results that, all able behaviour 42CrMo. Using Arrhenius type equation modified Zener-Holloman parameter yield point, Modified Ⅲ gives most favourable prediction accuracy with R2 0.9569, other also effective higher than 0.91. can be reflect peak stress. In addition, applicability advancement presented discussed. considered reflecting occurrence completion dynamic recrystallization (DRX) materials. It shown that studied capable predicting DRX, comparable results obtained experimental data.