Abstract
Surface modification by using a cavitating jet is proposed in order to improve fatigue strength of silicon manganese steel, to introduce compressive residual stress into surface of metals, and to improve corrosion resistance of the carbon steel. Thus, the cavitating jet can be used for surface modification instead of shot peening. In case of the surface modification by using acavitating jet, it is possible to peen surface of materials without shots. It can be called "shotless peening". The great advantage of the shotless peening is that it is easy to peen the bottom of the gear tooth, since the shots do not stack between the tooth. In the present paper, in order to demonstrate peening of gear, the residual stress of the surface of the gear before and after exposing to a cavitating jet was measured by using an X-ray diffraction apparatus. The peening area was also measured by using a paintmethod.
