Hot Compression Deformation Behavior and Variable ParameterArrhenius Constitutive Equation of 60 Steel

Hot compression tests were carried out on 60 steel at different temperatures (730, 750, 800, 850, 900, 1 000 ℃) and different strain rates (0.01, 0.1, 1, 5, 10 s^-1) with a Gleeble-1500 thermal simulator; the total true strain was 0.8. The deformation behavior of 60 steel during the hot compression process was analyzed. A variable parameter Arrhenius constitutive model was introduced. The relationships between the parameters of the model and the strains were fitted by a fifth-order polynomial, and then the constitutive equation for high temperature deformation of 60 steel was established. The accuracy of the equation was evaluated. The results show that the higher the deformation temperature or the lower the strain rate, the lower the flow stress of 60 steel. At lower temperatures and higher strain rates, the softening mechanism of hot compression deformation of 60 steel was mainly dynamic recovery; at higher temperatures and lower strain rates, it was mainly dynamic recrystallization. The fitting correlation coefficient between the predicted flow stresses by the established variable parameter Arrhenius constitutive equation and the experimental values was up to 0.994 597, indicating that the constitutive equation could describe the high temperature deformation behavior of 60 steel well.