| Project/Area Number |
15K14177
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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 |
Material processing/Microstructural control engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Research Collaborator |
Sato Mitsutaka
Shimaya Shota
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 浸窒処理 / 高窒素オーステナイト / 相変態 / ナノラメラ二相組織 / 相安定性 |
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| Outline of Final Research Achievements |
In order to create a novel nano-lamellar dual phase structure utilizing an incomplete transformation of bainite transformation in iron alloys, exploration of preparation condition of high nitrogen steels using nitriding and quenching process and the effect of alloying element on the concentration behavior of nitrogen and phase stability of each phase were investigated.
In this study, pure iron and Fe-1mass%M alloys containing Si, Cr, Mn and Mo were used as starting materials. The samples with uniform nitrogen concentration were successfully obtained by controlling the partial pressure of introduced gas and treatment temperature. In the subsequent isothermal transformation treatment, formation of iron nitride was suppressed by Cr and Mo addition, and it became clear that a large amount of austenite retained.
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