Rolling Contact Fatigue Behaviors of High Carbon Bainitic Bearing Steel

doi:10.3901/JME.2017.24.110

Abstract

Abstract: Bainitic bearing steel of GCr15Si1Mo has been selected as the testing material in this paper. The point rolling contact fatigue experiments are carried out under a well lubricated condition with/without oil lubrication condition. The steel with different volume fractions of carbide are tested. The surface morphology and the distribution of carbides in microstructure of the samples before and after rolling contact fatigue test are observed by scanning electron microscopy. The rolling fatigue properties of these specimens are determined by the Weibull plots. The results show that the rolling fatigue property of the specimen with 1.9 vol.% carbide is superior to the specimen of 5.1 vol.% carbide without lubrication condition. However the order of quality of rolling fatigue property under a well oil lubricated condition of the specimen, from best to the worst is:the specimen without carbide, the specimen with 5.1 vol.% carbide and with 1.9 vol.% carbide. The carbide is easy to be the rolling fatigue crack source as it is a hard phase in matrix of the steel. Then the specimen without carbide shows the best rolling fatigue property. The pits are formed on the surface of the sample after the carbides are fallen off, which increase the adhesive force between the lubricating oil and the surface of specimen. This is beneficial to increasing the oil film thickness during the process of test. Therefore, the rolling contact fatigue life of the specimen is improved.

Key words: bainite, bearing steel, carbide, rolling contact fatigue

CLC Number:

TG142

ZHENG Chunlei, SHE Li, WANG Yanhui, YANG Zhinan, ZHANG Fucheng. Rolling Contact Fatigue Behaviors of High Carbon Bainitic Bearing Steel[J]. Journal of Mechanical Engineering, 2017, 53(24): 110-117.

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