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(State Key Laboratory of Advanced Special Steel,Shanghai Key Laboratory of Advanced Ferrometallurgy , School of Materials Science and Engineering, Shanghai University, Shanghai 200072,China) a mingyuw@163.com, b hhzhang@shu.edu.cn * Corresponding author: Henghua Zhang Abstract: In this paper, the influence of banded carbide structure on Rolling Contact Fatigue (RCF) of GCr15 bearing steel was investigated by using MMS-2A double-roller wear tester under dry friction at room temperature. Surface damage was characterized using SEM and OM. The results showed that with the increase of banded carbide grade, wear rate and friction coefficient were obviously increased and contact fatigue performance was deteriorated. For the high grade of banded carbide, the main failure form is fatigue pits and surface cracks. On the contrary, for the low grade of banded carbide, the main failure form is flaking off. Besides, with the increment of banded carbide grade, the thickness of plastic deformation layer increase. The fatigue cracks easy propagated in the plastic deformation layer along the rolling direction. Therefore, by reducing the banded carbide grade can effectively improve the rolling contact fatigue properties of bearing steel.

Effect of banded carbide structure on the rolling contact fatigue of GCr15 bearing steel