GCr15轴承钢低温离子渗硫层的组织与耐磨性能

采用OM、XRD、SEM和UMT摩擦磨损试验机等对不同表面处理后GCr15轴承钢的显微组织和耐磨性能进行了研究。结果表明,相比于碳氮共渗后的GCr15轴承钢,碳氮共渗+低温渗硫后的GCr15轴承钢表面形成了以FeS为主的渗硫层,其微观形貌呈现均匀细小的颗粒状,虽硬度略有下降,但摩擦因数和体积磨损率均明显降低,可显著提高轴承材料表面抗擦伤、抗咬合的能力,从而延长轴承零部件的使用寿命;在磨损过程中,FeS层发生脱落、产生涂抹效应,显著降低了磨粒磨损的程度。通过磨损形貌分析,磨损机制为磨粒磨损和粘着磨损。

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

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.