Abstract
Shot-peening treatment is very useful for the improvement of the fatigue strength. But the higher surface roughness induced by the hard shot-peening (HSP) treatment was negative factor of the fatigue strength. So, for the more improvement of the fatigue strength, it can be possible by improving the surface condition of the HSP treated material. In this paper, rotating bending fatigue tests on two type of specimens were carried out. One is the surface polished-HSP specimen and the another is the W-shot peened specimen. As the result of fatigue test, the surface roughness improving was effective for the improvment of fatigue strength on the HSP treated specimen. These fatigue properties were investigated by surface roughness profiles, residual stress distributions and hardness distributions.
