2009 Fiscal Year Final Research Report
Research on Mechanics and Mechanisms of Stress Corrosion Cracking Based upon Mechano-Chemical Oxidation Kinetics
| Project/Area Number |
17106002
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| Research Category |
Grant-in-Aid for Scientific Research (S)
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| Allocation Type | Single-year Grants |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Tohoku University |
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Principal Investigator |
SHOJI Tetsuo Tohoku University, 大学院・工学研究科, 教授 (80091700)
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| Co-Investigator(Kenkyū-buntansha) |
MIURA Hideo 東北大学, 大学院・工学研究科, 教授 (90361112)
MIYAMOTO Akira 東北大学, 未来科学技術共同研究センター, 教授 (50093076)
KUBO Momoji 東北大学, 大学院・工学研究科, 教授 (90241538)
OGAWA Kazuhiro 東北大学, 大学院・工学研究科, 准教授 (50312616)
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| Project Period (FY) |
2005 – 2009
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| Keywords | 応力腐食割れ / 軽水炉発電プラント / 酸化特性評価 / 粒界 / 量子化学分子動力学 / 酸化則の応力依存症 |
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| Research Abstract |
Special emphasis was made on the oxidation phenomenon accompanied with mass transport in the singular stress field at the crack tip region of stress corrosion crack (crack oxidation model) which has been proposed and clarified by this group. The oxide formation energy and the oxygen diffusion kinetics were evaluated quantitatively by quantum chemistry molecular dynamics. Accelerated SCC crack growth rate testing methodology was derived from crack oxidation model and used to confirm a role of such additional elements.
Crack growth rate of the stainless steel that contained plausible additive elements was increased in order of the one which contained Y〓W=Ce<Zr. Except for Zr containing steel, the crack growth rates were lower than those of nuclear grade stainless steels. In addition, the same reason was thought for the results obtained in the oxidation test underhigh stress that indicated Zr containing steel shows faster growth rate than the others. These results showed the adequacy for the model. Such disparity observed in Zr containingsteel also proposed an issue that recently reported hydrogen accelerated oxidation shall be considered in future.
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