Pages 19-20
The purpose of this study is to investigate the influence of shot peening on the pitting strength of case-hardened steel rollers. The hardness, the compressive residual stress and the surface roughness of the rollers increased by the shot peening. The failure mode of the rollers was pitting. The surface durabilities of most shot-peened rollers were higher than that of the unpeened roller in these experiments. Especially, the smaller the surface roughness of the shot-peened rollers was, the higher the surface durabilities of them were. The increase of the surface roughness by the stronger shot peening resulted in the shorter fatigue lives of the shot-peened rollers. Therefore, it could follows from this that the light shot peening should be selected in order to improve the pitting strength of the steel rollers in these experimental range.
