Abstract
The purpose of this study is to investigate the influence of shot peening on the surface durability of sintered powder metal rollers. The test rollers employed in this study were made of the sintered material with a density of 7.01g/cm^3. The test rollers were shot-peened under different conditions. The surface roughness and the compressive residual stress of all the rollers were increased by the shot peening. On the other hand, the surface hardness was not increased. The rolling contact fatigue test of the rollers was performed under a sliding-rolling contact condition using a roller testing machine. The failure mode of the test rollers was spalling due to subsurface cracking. A crack occurred at a pore below the roller surface. Judging from the p_<max>-N curves, the surface durability of the shot-peeened rollers was smaller than that of the non-peened roller.
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