Abstract
A series of rolling contact fatigue tests has been done using a carburized steel with and without shot peening. Continuous observations were carried out on the initiation and propagation of cracks. The distribution of and change in residual stress in the course of rolling were measured. Changes in microstructure were observed by transmission electron microscopy. Distributions of retained austenite before and after shot peening were determined by X-ray diffraction. The contact fatigue lifetime is lengthened and the crack propagation rate decreased by shot peening. In the course of rolling, the high residual stress induced by shot peening was not relaxed after repeated rolling contact. On the basis of the experimental results, the effect of shot peening on rolling contact fatigue behaviour in carburized steel has been analysed, which will be valuable in practice.
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