2015 Fiscal Year Final Research Report
Determination of T-T-T curve of high nitrogen austenite and application for the surface treatment
| Project/Area Number |
25420688
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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 |
Physical properties of metals/Metal-base materials
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| Research Institution | University of Tsukuba |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | 窒素オーステナイト / 熱処理 / 電気抵抗 / 組織観察 / TTT曲線 |
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| Outline of Final Research Achievements |
Isothermal transformation curve for high nitrogen austenite (10 at. %N) was determined using a combination of electric resistivity measurements and microscopic observations. The transformation curve forms double C curve with nose temperature of 400 C. Isothermal aging above 480 C resulted in formation of the Fe4N precipitation prior to the Braunite transformation. Bainitic microstructure was formed at temperature lower than 450 C. Hardness of 750 Hv was recorded in austenite layer formed in mild steel rod of 10 mm in diameter upon aging at the nose temperature for 10 min.
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| Free Research Field |
材料物性
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