A thermo-viscoplasticity model for metals over wide temperature ranges- application to case hardening steel

Abstract In this contribution, a model for the thermomechanically coupled behaviour of case hardening steel is introduced with application to 16MnCr5 (1.7131). The based on decomposition free energy into thermo-elastic and plastic part. Associated viscoplasticity, in terms temperature-depenent Perzyna-type power law, combination an isotropic von Mises yield function takes respect strain-rate dependency stress. covers additional temperature-related effects, like temperature-dependent elastic moduli, coefficient thermal expansion, heat capacity, conductivity, stress cold work hardening. formulation fulfils second law thermodynamics form Clausius–Duhem inequality by exploiting Coleman–Noll procedure. parameters are fitted against experimental data. An implementation fully finite element provided representative numerical examples presented showing aspects localisation regularisation proposed model.