Validation of a Model of Plastic Deformation of C-Mn Steels in the Two-Phase Temperature Region

The paper describes the validation of a thermal-mechanical-microstructural model of deformation of carbon-manganese steels in the two-phase temperature region. The model has been developed on the basis of dilatometric and plastometric tests performed for a wide range of temperatures and strain rates. Dilatometric tests were used to identify the phase transformation model and plastometric tests were used to identify the flow stress model. Inverse analysis was applied to find the parameters of the models which were further implemented into a finite element code. Numerical simulations of the deformation of steels in the two-phase temperature range were performed. Multi-stage plane strain compression tests were performed to validate the model. The samples were quenched after subsequent stages of the tests and metallographic analysis was performed. Predicted loads, grain size and volume fractions of the microstructural components were compared with measurements and the coefficients in the models were updated.