High temperature rheological stress model for new type Cr-Mo-V hot work die steel
Through hot compression experiments,true stress-true strain curves of the experimental steel were obtained under the condi-tions of deformation temperature of 950-1200℃,strain rate of 0.001-5 s-1 and the maximum true strain of 0.916.The results indicate that under the deformation conditions selected in this experiment,the new Cr-Mo-V steel appears typical dynamic recrystallization charac-teristic.When the deformation temperature is higher than 1050℃and the strain rate is lower than 0.1 s-1,the dynamic recrystallization characteristic is more obvious.At the same deformation temperature,the peak stress and peak strain show an increasing trend with the in-crease of strain rate.At the same strain rate,the peak stress and steady-state stress gradually decrease with the increase of deformation temperature.The multiple linear regression method was used to obtain the Arrhenius equation model parameters corresponding to the peak stress,and the high-temperature rheological stress constitutive model for experimental steel was established based on this.The flow stress of the experimental steel was calculated by using the octave polynomial of the material constant of the constitutive equation created with dif-ferent strains,the strain compensation correlation coefficient R and the average absolute relative error eAARE are 0.98902 and 3.21%,re-spectively,and the calculated data are in good agreement with the experimental data.
hot work die steelhot compressionrheological stressconstitutive equationoctave polynomial
万方数据
维普
