The high-temperature compression experiments at deformation temperature of 1173.15-1473.15 K and strain rate of 5～20 s-1 of 15CrMoG heat-resistant steel were carried out by Gleeble-3500 thermal simulator.The experimental data show that 15CrMoG has nega-tive temperature sensitivity and positive strain rate sensitivity,and the recrystallized grain size markedly increases with the increase of de-formation temperature.The material parameters of Arrhenius constitutive model were solved by linear fitting,and the constitutive models of characterization parameters and physical basis parameters based on peak stress were established.The Pearson correlation coefficient be-tween the predicted value of peak stress and the experimental data is 0.99824 in the constitutive model of characterization parameters,and 0.99807 in the constitutive model of physical basis parameters.To further improve the applicability of the constitutive model,the Arrhe-nius constitutive model considering strain compensation was established,and the prediction for flow stress in the whole strain range was re-alized.In the whole strain range,the error analysis of the models was carried out.The maximum relative error of the constitutive model of characterization parameters is 3.76％,and the maximum relative error of the constitutive model of physical basis parameters is 6.04％.
维普
万方数据