Numerical Simulation of Edge Side Rollover Defect Formation of 430 Stainless Steel Hot Rolled Slab

The thermal compression deformation tests of 430 stainless steel were carried out at different temperatures (1 173.15-1 473.15 K) and strain rates (0.01-10 s^-1). Based on the rheological data, the modified Zerilli-Armstrong equation was established and its predictive ability was evaluated. The parameters of the constitutive equation were introduced into Deform-3D software to simulate the deformation of test steel in five-pass reversible hot rolling. The forming of edge defects was analyzed and the defects were compared with the actual rolling defects. The results show that the modified Zerilli-Armstrong constitutive equation could well describe the rheological behavior of the test steel at high temperature. The correlation coefficient between the predicted and the test flow stresses was 0.993 9, and the average relative error was 5.9%.The friction force between the roll and the slab caused the lateral displacement difference between the surface and the inside of the slab during rolling, which led to side joint turning up to the surface and the formation of edge side rollover defect. The location and morphology of the defects were consistent with the results of industrial trial production.