GCr15轴承钢双淬火对组织性能影响

doi:10.13228/j.boyuan.issn0449-749x.20220155

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Abstract A double quenching process for GCr15 bearing steel is designed. Compared with the conventional heat treatment process,it is found that the tensile strength of GCr15 bearing treated by double quenching process is increased from 2 139.5 MPa to 2 654.5 MPa,and the median fatigue strength of rotary bending is increased from 1 000 MPa to 1 029 MPa. According to the qualitative characterization of the matrix structure,it was found that the structure after the two kinds of heat treatment was acicular martensite. Through quantitative calculation,it was found that the retained austenite content increased from 8.33% to 11.26%,and the dislocation density increased from 2.45×10¹²/cm² to 3.09×10¹²/cm². By means of scanning electron microscope,it is found that the double quenching process does not change the size,quantity and type of inclusions. Through the analysis of the relationship between microstructure and mechanical properties,it is found that the improvement of tensile strength,elongation and high cycle fatigue strength caused by double quenching is mainly attributed to the slow trip effect of retained austenite and the deformation uniformity caused by fine crystallization. Through the analysis of the relationship between microstructure and fatigue properties,it is found that the decrease of low cycle fatigue strength and the increase of high cycle fatigue strength caused by double quenching are mainly attributed to the transformation rate of retained austenite. The rapid austenite transformation leads to the increase of low-cycle stress concentration and the decrease of fatigue strength. On the contrary,the high cycle austenite trip relieves the stress concentration and improves the fatigue strength.

Key words： GCr15 double quenching process grain size retained austenite rotational bending fatigue

Received: 07 March 2022

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	Articles by authors
	BAN Jia-le
	SHI Zhi-yue
	YU Feng
	CAO Wen-quan
	GUO Yu-zhong

Cite this article:

BAN Jia-le,SHI Zhi-yue,YU Feng等. Effect of double quenching on microstructure and properties of GCr15 bearing steel[J]. Iron and Steel, 2022, 57(9): 114-122.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220155 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I9/114

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