Research on Microstructure and Friction Wear Performance of GCr15 and G20CrNi2Mo Bearing Steel
MA Biao1,2, FU Lihua1,3, SHANGGUAN Bao1, DU Sanming1, YUE Yun1, 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; 3 State Key Laboratory of Tribology Tsinghua University, Beijing 100084, China
Abstract: In order to investigate the friction performance of bearing steel with different microstructure under different load and speed, the microstructure, phase and properties of GCr15 high-carbon bearing steel and G20CrNi2Mo carburizing bearing steel were analyzed by the scanning electron microscope (SEM), X-ray diffraction (XRD) and hardness tester, etc. The dry friction experiment of bearing steels under different conditions was conducted by UMT friction and wear tester. Then, the wear performance was analyzed. The results show that the friction coefficient and wear rate both GCr15 high-carbon bearing steel and G20CrNi2Mo carburized bearing steel in this work are decreased with the increasing of load and increased with the increase of friction velocity under this experimental conditions. When the friction velocity is low, the friction and wear performance of GCr15 high-carbon bearing steel is better than G20CrNi2Mo carburized bearing steel. When the friction velocity is 0.17 m·s-1, G20CrNi2Mo carburized bearing steel shows better wear performance than that of GCr15 high-carbon bearing steel. The wear mechanism results indicate that the adhesive wear and abrasive wear is the mainly wear mechanism for both bearing steels, and the degree of adhesive wear on the surface of G20CrNi2Mo carburized steel is more serious.
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