Views:8 Author:Site Editor Publish Time: 2018-11-05 Origin:Site
The secondary hardening of high chromium cast steel composite roll working layer refers to the precipitation process of proeutectoid carbide after high-temperature quenching of roller. After the high chromium cast steel roller is heated to the austenitizing temperature, it should be cooled and keep chromium, molybdenum, vanadium and other alloy elements in austenite. After the temperature up to 600℃, isothermal transformation converts Mo2C and M3C cementites to M7C3, and makes Mo2C and V4C3 carbides precipitated from martensite in order to achieve the "dispersion strengthening". This process is called secondary hardening of high chromium cast steel roll.