M50NiL轴承钢渗层碳化物特征与滑动磨损行为的研究  

Research on carbide characteristics and sliding wear behavior of carburized layer of M50NiL bearing steel

作　　者：吝欢 王凯[2,3] 杨卯生 曹建春[3] 宋波[1] 刘天祥[2,3] LIN Huan;WANG Kai;YANG Maosheng;CAO Jianchun;SONG Bo;LIU Tianxiang(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Research Institute for Special Steel,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China;College of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]钢铁研究总院有限公司特殊钢研究院,北京100081 [3]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《钢铁研究学报》2022年第7期701-712,共12页Journal of Iron and Steel Research

摘　　要：研究了M50NiL轴承钢在不同磨损时间和外加应力作用下的磨损行为和机制。结果表明:渗碳层组织为孪晶马氏体和近球状MC、M_(23)C_(6)和棒状M_(2)C型碳化物。外加应力对钢的磨损形式与形貌具有显著影响,钢的磨损形式为轻微粘着磨损和磨料磨损,摩擦因数较快保持稳定到0.02。延长磨损时间对钢的磨损性能与机制具有明显作用,磨损时间达到3万s,MC、M_(23)C_(6)、M_(2)C脱落,部分碳化物破碎形成磨料磨损。磨损时间与外加应力耦合作用显著影响钢的磨损性能与质量,磨损时间为3000 s,外加应力由0.306 MPa增至1.530 MPa,碳化物导致磨料磨损,磨损质量由0.25 mg增至0.38 mg;外加应力增至2.142 MPa,更多大尺寸碳化物脱落,导致钢的摩擦因数逐渐升高至0.037,磨损质量达到0.33 mg。The wear behavior and wear mechanism of M50 NiL bearing steel under different wear times and applied stresses were studied.The results show that the microstructure of the carburized layer is composed of twin martensite,nearly spherical MC,M_(23)C_(6)and rod-like M_(2)C carbides.The applied stress has a significant effect on the wear form and morphology of steel.The wear forms of the steel are slight adhesive wear and abrasive wear.The friction coefficient of the steel keeps stable to 0.02.Prolonged wear time has an obvious effect on the wear property and mechanism of steel.When the wear time reaches 30000 s,MC,M_(23)C_(6)and M_(2)C carbides rub off.Some carbides are broken and subsequently formed abrasive wear.The coupling effect of wear time and applied stress significantly affect the wear property and quality of steel.When the wear time is 3000 s,the applied stress increases from 0.306 MPa to 1.530 MPa.The wear weight-loss increases from 0.25 mg to 0.38 mg due to carbides abrasive wear.When the applied stress increases to 2.142 MPa,large scale carbides rub off.This leads to the increasing of the friction coefficient to 0.037 and the wear mass to 0.33 mg.

关 键 词：M50NiL轴承钢 碳化物 摩擦因数 磨料磨损 磨损机制 

分 类 号：TG142.1[一般工业技术—材料科学与工程]