Experimental Study on Preheat Treatment of Cr-mo Alloy Carburized Steel Thick-walled Tooth Sleeve Forging Blanks

Chen Yun1, Huang Baihong1, Zhang Feng1, Yang Liangbo1, Zhang Yu1, Sun Huanhuan2

（1. Material Technology Research Institute of Dongfeng Commercial Vehicle Technical Center, Shiyan 442001； 2. Dongfeng Forging Co., Ltd., Shiyan 442012）

Abstract： Isothermal normalization process test is conducted with different heating temperature and heat preservation time for Cr-mo alloy carburized steel thick-walled tooth sleeve forging blank, and the suitable isothermal normalization process parameters for this type of tooth sleeve forging blank is finally confirmed to be 620 ℃×4 h. After the isothermal normalization treatment, the forging blank will not have any abnormal structure such as bainite or martensite in the forging skin position, and there is no broach damage during the subsequent processing.

Key words: Cr- Mo alloy carburized steel, Thick- walled tooth sleeve forging blank, Isothermal normalizing, Process test