OS1203 ファンダメンタルパラメータ法によるステンレス鋼のミクロ歪の評価(X線,放射光,中性子による材料・材料強度評価,オーガナイズドセッション)

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  • OS1203 Evaluation of Micro-Strain in Stainless Steel by Fundamental Approach

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In order to make clear mechanism of fatigue fracture and improvement of fatigue strength by cavitation peening, micro-strain was evaluated by using a fundamental approach. In the previous reports, micro strain induced by heat treatment and/or mechanical finishing was decreased by cavitation peening. As the micro strain might be a source of fatigue crack, the decrease of the micro strain causes improvement of fatigue strength. In the present paper, the micro strain of stainless steel was measured by the fundamental approach, which was one X-ray diffraction method and normally used for the measurement of grain size and micro strain of nano-size powder. The micro strain before and after cavitation peening and the micro strain changing with fatigue cycles were investigated. It was revealed that the micro strain induced by grinding was decreased by cavitation peening. The micro strain was changing with fatigue cycles.

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