2013 Fiscal Year Final Research Report
Effects of crystal microstructure on residual stress relaxation
| Project/Area Number |
23360061
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Japan Atomic Energy Agency |
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Principal Investigator |
AKITA Koichi 独立行政法人日本原子力研究開発機構, 原子力科学研究部門 量子ビーム応用研究センター, 研究主幹 (10231820)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Hiroshi 独立行政法人日本原子力研究開発機構, 原子力科学研究部門 量子ビーム応用研究センター, 研究副主幹 (10373242)
IMAFUKU Muneyuki 東京都市大学, 工学部, 教授
KURODA Masatoshi 熊本大学, 自然科学研究科, 准教授 (00432998)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 残留応力緩和 / ショットピーニング / レーザーピーニング / 中性子回折 / X線回折プロファイル解析 |
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| Research Abstract |
Peening techniques, such as shot-peening and laser-peening, introduce compressive residual stresses in the surface layer of metallic materials. The compressive residual stress is effective for preventing stress corrosion cracking and fatigue fracture, therefore the peening techniques have been applied to power plant structures. However, the compressive residual stress might decrease due to thermal and/or mechanical loading in service, and it reduces the benefit.
In this study, the relaxation behavior of the compressive residual stress due to mechanical and thermal cyclic loading were investigated by in-situ neutron diffraction techniques. Also, the microstructures introduced by shot-peening and laser-peening were observed by an X-ray diffraction line profile analysis, and the relationships between the microstructures and the relaxation behavior of the compressive residual stress were discussed.
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