| Project/Area Number |
25630315
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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 |
MIYAMOTO Goro 東北大学, 金属材料研究所, 准教授 (60451621)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | マルテンサイト変態 / 逆変態 / 組織微細化 / 結晶学 / せん断型変態 |
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| Outline of Final Research Achievements |
In order to establish novel grain refinement method, we've investigated microstructure change during cyclic displacive forward and reverse transformations. It was found that displacive reversion takes place in Fe-18Ni and Fe-23Ni alloys. As a results of reversion and forward transformations in Fe-Ni alloy, grain size decreases although further refinement cannot be achieved with increasing the number of cycles. On the other hand, grain size decreases continuously with increasing number of cycles in carbon added alloy. Eventually, sub-micron grain can be obtained after 10 cycles in this alloy.
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