Fabrication of Ultrafine Grained Austenitic Steel by Chemical Stability Controlled Phase Transformations
| Project/Area Number |
24560852
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Kyushu University |
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Principal Investigator |
NAKADA Nobuo 九州大学, 工学(系)研究科(研究院), 助教 (50380580)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Masaki 九州大学, 大学院工学研究院, 准教授 (40452809)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
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| Keywords | 鉄鋼材料 / 構造・機能材料 / 相変態 / 組織制御 / 超微細粒鋼 |
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| Outline of Final Research Achievements |
For further strengthening of TWIP steel which is expected as a next generation automotive steel sheet, a new heat treatment to promote precipitation and dissolution of carbide was applied for Fe-Mn-C alloys, leading to grain refinement via phase transformations. As a result, it was confirmed that austenite matrix is unstabilized after (austenite + carbide) two phase austenitization, namely partial solution treatment, and the heat treatment stimulates martensitic transformation in austenitic steel without any cold-deformation. In addition, it was found that reversion mechanism is discontinuously shifted from diffusive type to martensitic one with increasing heating rate in low Mn steels.
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Report
(4 results)
Research Products
(8 results)
