高碳铬钢凝固及热处理组织演变规律

The microstructure evolution of high chromium steel used as the working layer of composite roll materials during solidification and heat treatment was studied systematically. The equilibrium phase diagram was calculated by Thermo-Calc software to clarify the precipitation behavior of carbides in the process of equilibrium solidification and cooling. The effect of austenitizing temperature on the phase transformation behavior was accurately measured by thermal dilatometer, and the isothermal transformation kinetic curve of pearlite was obtained. Combined with scanning electron microscope, energy dispersive spectrometer and X-ray diffraction analysis, the effect of heat treatment process on the final microstructure is determined, and the effect of primary carbide M, C3 and secondary carbide formed during solidification on the heat treatment structure is clarified, which provides a theoretical basis for the practical heat treatment process of high chromium steel composite roll working layer material.