1309 キャビテーション・ショットレス・ピーニングによる処理面の残留応力の特異性(G03-2 き裂進展・疲労損傷・表面処理,G03 材料力学)

概要

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Cavitation impacts normally cause severe damage in hydraulic machinery. However, cavitation impacts can be utilized for surface enhancement as same way as shot peening SP. Peeing method using cavitation impacts is called as "cavitation shotless peening CSP," as shots are not required. Fatigue strength of carburized chrome-molybdenum steel treated by CSP was better than that of SP, even though the residual stress of CSP was lower than that of SP measured by a conventional X-ray diffraction method. CSP can also improves the life time of forging die, even though introduced compressive residual stress was not so large. Recently, 2D method using two dimensional position sensitive proportional counter PSPC has been developed to measure micro strain. In case of 2D method, the residual stress within thin layer near surface can be measured by controlling an incident angle of X-ray. The distribution of residual stress of sub-surface peened by CSP changing with depth was measured by 2D method without removing the surface. It was concluded that the compressive residual stress on the surface of CSP was larger than that of SP.
2005-09-18