| Project/Area Number |
26630352
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Structural/Functional materials
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| Research Institution | Kyushu University |
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Principal Investigator |
Takaki Setsuo 九州大学, 工学(系)研究科(研究院), 教授 (90150490)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 鉄鋼材料 / 耐水素脆化特性 / 加工誘起マルテンサイト変態 / 固相窒素吸収処理 |
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| Outline of Final Research Achievements |
In this study, the stabilization of surface austenite layer was attempted by applying the solid nitrogen absorption treatment in order to realize the high strength and performance against hydrogen embrittlement in a conventional austenitic stainless steel (SUS 304). As a result, it was found that 1) the austenite phase containing 0.4% or more is stable even after 60% cold working, 2) the stable austenite layer plays a role to retard the hydrogen absorption from the surface, 3) the center potion of material has been strengthened to a high level by the deformation induced martensitic transformation. As expected in the initial research plan, a high strength stainless steel with high performance against hydrogen embrittlement could be fabricated by applying the solid nitrogen absorption treatment to SUS 304.
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