Evolution and Control of Surface Decarburization in Automobile Front Axle Steel 42CrMoH
ZHANG Chengcheng1, MA Xiaolei1, ZHANG Chaolei1, LI Jian2, ZHAO Haidong3, LIU Yazheng1
1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 School of Mechanical Engineering, Qinghai University, Xining 810016, China 3 Xining Special Steel Co. Ltd, Qinghai Special Steel Engineering Technology Research Center, Xining 810005, China
Abstract: The front axle made of 42CrMoH steel was found to have a complete decarburization layer of 0.10—0.15 mm deep on the surface of the workpiece, which seriously affects the surface quality, hardness and fatigue performance of the front axle. In this paper, the isothermal heating experiment was carried out to study the effects of heating temperature on the depth and type of decarburization layer of 42CrMoH steel, and the factors affecting surface decarburization were analyzed. The results show that when the heating time is 75 min, 42CrMoH steel has only partial decarburization layer at 650—750 ℃ and 875—1 250 ℃; and the formation temperature of complete decarburization layer is 750—875 ℃, and the ferrite is the coarse columnar crystals in the complete decarburization layer, and there is a complete decarburization sensitive temperature range of 775—825 ℃, and the complete decarburization layer depth reaches the maximum at 800 ℃. Partial decarburization also has a sensitive temperature range of 1 150—1 250 ℃, and the depth reaches a maximum at 1 200 ℃. Therefore, the normalizing and quenching temperatures of the 42CrMoH heat treatment should be controlled at 875—885 ℃, and avoid staying at 750—875 ℃ for too long during the cooling process, in order to avoid the complete decarburization layer. In addition, due to normalizing and quenching heating processes are eliminated, residual heat of for-ging quenching can greatly avoid complete decarburization of the workpiece.
张成成, 马潇磊, 张朝磊, 李戬, 赵海东, 刘雅政. 汽车前轴用42CrMoH钢表面脱碳演变规律及控制[J]. 材料导报, 2020, 34(12): 12127-12131.
ZHANG Chengcheng, MA Xiaolei, ZHANG Chaolei, LI Jian, ZHAO Haidong, LIU Yazheng. Evolution and Control of Surface Decarburization in Automobile Front Axle Steel 42CrMoH. Materials Reports, 2020, 34(12): 12127-12131.
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2020, Vol. 34 
