汽车前轴用42CrMoH钢表面脱碳演变规律及控制

doi:10.11896/cldb.19050076

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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.

Key words： automobile parts surface decarburization heating temperature residual heat of forging quenching

Published: 29 May 2020

CLC number:

TG 142.41

Fund:This work was financially supported by the Science and Technology Project of Qinghai Province, China (2018-ZJ-747).

About author:: Chengcheng Zhang is a graduate student of Materials Science and Engineering, University of Science and Technology Beijing. Under the guidance of associate professor Zhang Chaolei, the main research fields are material forming theory and microstructure performance control.
Chaolei Zhang received his Ph. D. degree in material processing engineering from University of Science and Technology Beijing in January 2013. He is currently an associate professor in USTB, and selected into Qinghai province's “Thousands of High-end Innovative Talents Program”. His research interests are control of material microstructure and properties, development and application of advanced steel materials. He has published more than 30 papers as the first author. And more than 10 patents for invention were authorized.

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	ZHANG Chengcheng
	MA Xiaolei
	ZHANG Chaolei
	LI Jian
	ZHAO Haidong
	LIU Yazheng

Cite this article:

ZHANG Chengcheng,MA Xiaolei,ZHANG Chaolei, et al. Evolution and Control of Surface Decarburization in Automobile Front Axle Steel 42CrMoH[J]. Materials Reports, 2020, 34(12): 12127-12131.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19050076 OR http://www.mater-rep.com/EN/Y2020/V34/I12/12127

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