渗碳工艺对18CrNiMo7-6合金钢缺口件疲劳性能的影响

doi:10.11896/cldb.22100180

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Abstract In order to analyze the effect of carburizing process on the fatigue properties of the 18CrNiMo7-6 notched specimens, the notched specimens with stress concentration factor Kt=1.86 were carburized and then these rotating bending fatigue properties were measured. The microstructure, hardness and stress field of the specimens were characterized. The results show that carburizing heat treatment can significantly promote the surface hardness of the sample and introduce residual compressive stress. The fatigue limit of the notched samples is increased more than 100% compared with the uncarburized samples. With the increase of the depth of effective hardening layer, the fatigue limit of notched specimens increases first and then decreases. The fatigue sources of the uncarburized and carburized specimens are at the surface of notch root, and both of them are multi-source fracture. During fatigue, martensitic transformation of the retained austenite takes place on the surface of carburized specimen, and there is a critical value for its transformation.

Key words： 18CrNiMo7-6 alloy steel stress concentration carburizing heat treatment process high cycle fatigue performance

Published: 25 January 2024 Online: 2024-01-26

CLC number:

TG156

Fund:National Natural Science Foundation of China (52001281, U1804254) and Key Scientific and Technological Research Projects in Henan Province (192102210012).

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	QIN Shengwei
	DI Liyin
	WANG Lianxiang
	ZHANG Chenghao

Cite this article:

QIN Shengwei,DI Liyin,WANG Lianxiang, et al. Effect of Carburizing on Fatigue Properties of Notched 18CrNiMo7-6 Alloy Steel[J]. Materials Reports, 2024, 38(2): 22100180-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22100180 OR http://www.mater-rep.com/EN/Y2024/V38/I2/22100180

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