Microstructure and wear resistance of GCr15 bearing steel with low-temperature plasma sulfurizing coatings

doi:10.13251/j.issn.0254-6051.2022.12.031

Abstract

Abstract: Microstructure and wear resistance of GCr15 bearing steel after different surface treatments were studied by means of OM, XRD, SEM and UMT friction and wear tester. The results show that compared with that carbonitrided, a FeS-based sulfurized layer with uniform and fine microstructure is formed on the surface of the GCr15 bearing steel after carbonitriding and low-temperature plasma sulfurizing, though the hardness decreases slightly, the friction coefficient and volume wear rate are significantly reduced, so that the ability of the bearing steel surface to resist scratching and to anti-biting is significantly improved, the service life of the bearing is also prolonged. During the wear process, the FeS layer falls off and produces a smearing effect, which significantly reduces the degree of abrasive wear. The analysis of the wear morphology confirms that the wear mechanisms are abrasive wear and adhesive wear.

Key words: GCr15 bearing steel, low-temperature plasma sulfurizing, self lubrication, microstructure, wear resistance

CLC Number:

TG156.8⁺4

Li De, Shan Qiongfei, Wang Xin, Liu Yong, Zhou Meng, Zhang Yi. Microstructure and wear resistance of GCr15 bearing steel with low-temperature plasma sulfurizing coatings[J]. Heat Treatment of Metals, 2022, 47(12): 181-187.

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