Influence of Bearing Steels Structure Uniformity on Friction and Wear Performance Under Unsteady States
SHAO Ruonan1, HE Tiantian1, LIU Jian1, DU Sanming1, ZHANG Yongzhen1
1 National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Luoyang 471023, China 2 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China
Abstract: To investigate the friction and wear properties of bearing steels with different microstructure under unsteady states. The microstructure, retained austenite (A′) and hardness of two kinds of GCr15 steels were analyzed by optical and scanning electron microscope (OM and SEM), X-ray diffraction (XRD) and hardness tester. The sliding friction and wear test under the unstable states of lean oil and dry friction was carried out by using the UMT-2 friction and wear equipment. The influence of microstructure on performance under unsteady states were studied by analyzed the wear trace morphologies by SEM and three-dimensional tester.The results show that the microstructure of domestic 1#GCr15 steel is nonuniform, and the microstructure shows typical “black and white zone” morphology after quenching and tempering, and the grade of banded and reticulated carbide is obviously higher than that of foreign 2#GCr15 steel. Under the two conditions, the friction coefficient and wear lose of 1#GCr15 steel are larger than 2#GCr15 steel. Under the condition of lean oil, the wear mechanism of both steels is abrasive wear. Under dry friction condition, 1#GCr15 steel is mainly characterized by oxidation, adhesion and spalling wear. 2#GCr15 steel is mainly adhesive wear, accompanied by a small amount of oxidation wear. Uneven carbide results in uneven structure of bearing steel, and increases the tendency of quenching crac-king, which leads to cracks in the surface area of bearing steel during the friction and wear process, resulting in spallation or early failure.
邵若男, 贺甜甜, 刘建, 杜三明, 张永振. 非稳态条件下轴承钢的组织均匀性对其摩擦磨损性能的影响[J]. 材料导报, 2021, 35(20): 20062-20067.
SHAO Ruonan, HE Tiantian, LIU Jian, DU Sanming, ZHANG Yongzhen. Influence of Bearing Steels Structure Uniformity on Friction and Wear Performance Under Unsteady States. Materials Reports, 2021, 35(20): 20062-20067.
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