Abstract
Water cavitation peening has been applied to thin sheets of austenitic stainless steel of 0.1 mm in thickness. The influence of cavitation peening on various factors related to the fatigue property of the material has been investigated. It has been found that the fatigue limit is increased by about approximately 10 %, while no significant changes in the surface roughness and the microstructure are observed. The residual stress evaluated by Full Width at Half Maximum (FWHM) of X-ray diffraction, and the mean value of micro-hardness on the surface are slightly decreased in the peened specimen. To investigate the origin of increase in fatigue strength, deformation behavior in the tensile test has been measured using electronic speckle pattern interferometry. The optical fringe patterns by ESPI (Electronic Speckle-Pattern Interferometry) during the transitional process from the elastic deformation to the yielding have shown that local plastic deformation due to the strain concentration was suppressed by the cavitation peening.
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