Modeling Flow Stress of 70Cr3Mo Steel Used for Back-Up Roll During Hot Deformation Considering Strain Compensation Original Research Article

A constitutive model incorporating the influence of strain developed based on the Arrhenius equation by considering the variation of material constants as a fifth polynomial function of strain is presented. Materials constants are fit to data from hot compression tests of 70Cr3Mo steel used for back-up roll at the temperatures from 1173 to 1473 K and strain rates from 0.01 to 10s−1 by using a Gleeble-1500D thermo-mechanical simulator. The developed constitutive model is then used to predict the flow stress under all the tested conditions. The statistical parameters of correlation coefficient and average absolute relative error are used to analyze the predictable efficiency and the values are 0.997 and 3.64%, respectively. The results show a good agreement between experimental stress and predicted stress.