Effect of temperature and rolling rate on high chromium cast iron/low carbon steel composite plate prepared by hot rolling

摘要

This study aimed to develop a process for preparing high-chromium cast iron (HCCI)/low-carbon steel (LCS) wear-resistant composite panels by hot rolled symmetrical billet. Hot rolling experiments were conducted at 1000, 1100, and 1200 degrees C with rolling rates of 0.5, 0.75, and 1 s(-1) and 60% rolling reduction. The effects of hot rolling parameters on the microstructure and mechanical properties of composite interface and HCCI layer were studied. Results showed that the composite plate can achieve hot rolling deformation with no crack at a large rolling reduction due to the stress release effect of the softer LCS. A higher rolling temperature (1200 degrees C) and a lower rolling speed (0.17 r/s) facilitated the metallurgical bonding of HCCI/LCS. The diffusion width of Cr between the interface and the interfacial shear strength increase with the increase in temperature and decrease in rolling rate. An increase in the rolling temperature caused a significant refinement of the HCCI carbide and an increase in the volume fraction of the carbide. As the rolling temperature increases, the overall hardness of the HCCI layer decreases because of an increase in retained austenite in the metal matrix, but the wear resistance is improved.