2013 Fiscal Year Final Research Report
Study of hydrogen embrittlement behavior by using pure Fe containing high-density lattice defects
| Project/Area Number |
23360304
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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 |
Structural/Functional materials
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| Research Institution | Toyohashi University of Technology |
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Principal Investigator |
TODAKA YOSHIKAZU 豊橋技術科学大学, 工学(系)研究科(研究院), 准教授 (50345956)
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| Co-Investigator(Kenkyū-buntansha) |
UEJI Rintaro 大阪大学, 接合科学研究所, 准教授 (80380145)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 強度 / 靭性 / 水素脆化 / ナノ組織 / 格子欠陥 / 巨大ひずみ加工 |
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| Research Abstract |
Grain refinement is important to create high strength metals, since both strength and toughness can be improved by grain refining. During the past decade, fabrication of bulk nano- / submicron- structured metals by severe plastic deformation (SPD), such as high-pressure torsion (HPT) straining, has evolved. Such SPD-processed metals often show extraordinary high strength and ductility. However, increase in tensile strength over 1.2 GPa in steels generally lead to hydrogen embrittlement (HE).
In this study, HE behavior was investigated by means of tensile test with wide-range strain rate of 10 -3 ~ 10 +3 s-1 in the nano-structured pure Fe produced by HPT-straining, since this investigation focused on the interaction of lattice defects and hydrogen in the sample during tensile test. In addition, we made the correlation between the influence of hydrogen on the void formation / crack propagation and the fracture / dynamic response by means of fractography.
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