Fatigue Crack Initiation in Proton-Irradiated Austenitic Stainless Steel
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概要
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The effect of irradiation on slip band formation and growth and microcrack initiation behavior under low cycle fatigue in SUS316L austenitic stainless steel was investigated using accelerator-based proton irradiation and a low cycle fatigue test at room temperature in air. The mean space of the slip line in proton-irradiated specimens was 25–40% wider than that in unirradiated specimens under the same number of cycles, possibly due to localized deformation by proton irradiation. The microcrack initiation life of the proton-irradiated specimens was approximately 20% of that of the unirradiated specimens. While the microcrack initiation in the unirradiated specimens was observed at the grain boundary, twin boundary, slip band, and triple junction, that in the proton-irradiated specimens was observed only at the twin boundary and slip band, possibly due to irradiation hardening. The step-height of an extrusion near the microcrack was almost the same in the unirradiated and proton-irradiated specimens regardless of the initiation site (100–150 nm). Therefore, the microcrack initiation was considered to occur when the surface morphology change involving the extrusion exceeded the specific threshold value.
- 一般社団法人 日本原子力学会の論文
著者
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NOGAMI Shuhei
Department of Quantum Science and Energy Engineering, Tohoku University
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SATO Yuki
Department of Quantum Science and Energy Engineering, Tohoku University
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HASEGAWA Akira
Department of Quantum Science and Energy Engineering, Tohoku University
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Hasegawa Akira
Department Of Applied Bioorganic Chemistry Gifu University
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Sato Yuki
Department Of Health Policy National Research Institute For Child Health And Development
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Sato Yuki
Department Of Quantum Science And Energy Engineering Tohoku University
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Nogami Shuhei
Department Of Quantum Science And Energy Engineering Graduate School Of Engineering Tohoku Universit
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Hasegawa Akira
Department Of Quantum Science And Energy Engineering Tohoku University
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