Deformation behavior of high-chromium cast iron / low-carbon steel laminates based on hot rolling and finite element simulation

Abstract

In this study, the hot deformation behavior of high-chromium cast iron (HCCI)/low-carbon steel laminates during hot rolling was studied via finite element simulation and experimentation. The effects of different rolling processes, including rolling reduction (30%, 45%, and 60%), rolling temperature (1000, 1100, and 1200 °C), and rolling speed (0.17, 0.26, and 0.34 r/s), on the forming quality of laminates were discussed. Results show that the shape of the laminates is straight without warping and grid distortion. The middle layer of the low-carbon steel plays a role in stress release. In terms of mechanics, large rolling reduction (60%), high rolling temperature (1200 °C), and low rolling speed (0.17 r/s) are favorable for increasing the interface stress and stress release time. This promotes interface recombination, reduces damage to the brittle HCCI layer, and effectively improves the bending and impact strengths of the laminates. In terms of microstructure, increasing the atomic active energy and diffusion time is beneficial to the formation of the microinterface morphology with high bonding quality and refinement of the HCCI carbide.