K-0709 キャビテーション・ショットレス・ピーニングによる疲労強度向上(S07-3 疲労信頼性の向上(熱処理,加工))(S07 表面改質とその機能特性評価)

概要

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Cavitation impacts, which normally cause damage to hydraulic machinery, can be used to improve the fatigue strength of metallic materials in a similar way to shot peening. Cavitation impact enables the surface of a material to be peened without the use of shot, thus it is called cavitation shotless peening. As there are no solid body collisions occurring in this peening process, the roughness of the peened surface should be less than that produced by shot peening. This characteristic makes it suitable for peening. In order to demonstrate the improvement of the fatigue strength of samples peened by cavitation impacts induced by the cavitating jet, a rotating bending fatigue test on specimens with and without peening is reported in this paper. The test materials were aluminum alloy (JIS AC4CH) and silicon manganese steel (JIS SUP7). It was revealed that the improvement of fatigue strength of aluminum alloy was 40% and that of silicon manganese steel was about 14%.
2001-08-22