Abstract
The effects of ultrasonic rolling processing on the properties of GCr15 bearing steel were studied in this paper. The specimens were treated with different values of preload in ultrasonic rolling processing. The surface roughness, microhardness and rolling contact fatigue life of the specimens before and after ultrasonic rolling processing were analysed and compared. The index of power density was firstly introduced and combined with ultrasonic rolling parameters. The results show that the qualities of surface roughness and microhardness are improved after ultrasonic rolling treatment, and the friction coefficient is reduced. However, when the ultrasonic rolling power density exceeds 11.24 Gw/cm2, the grain sizes of the specimens becomes larger, which leads to the increase of the internal stress, resulting in the initiation and propagation of crack. The propagation mode of fatigue cracks changes from transcrystalline to intergranular after ultrasonic rolling treatment, reducing the performances of wear resistance and rolling contact fatigue.
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