Surface Modification of Materials Using a Cavitating Jet

摘要

The impact produced by the collapse of a cavitation bubble can be used for surface modification to improve fatigue strength instead of shot peening. The cavitation impacts also improve corrosion resistance. In the case of cavitation around a high-speed submerged water jet, i.e., a cavitating jet, the cavitating region and cavitation intensity can be controlled by hydraulic parameters such as the upstream- and the downstream-pressure of a nozzle. It can be said that a cavitating jet is very useful for practical application.In this paper, examples of surface modification such as the improvement of fatigue strength and corrosion resistance using a cavitating jet are shown, including the explanation of a cavitating jet flow.