Phase equilibria and thermodynamic analysis of anomalous microstructure formation at low temperatures by heavy deformation and heat treatment processes
| Project/Area Number |
25289216
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial 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 | National Institute for Materials Science (2015)
Tohoku University |
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Principal Investigator |
OHNUMA IKUO 国立研究開発法人物質・材料研究機構, 理論計算科学ユニット, 主席研究員 (20250714)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIDA Kiyohito 東北大学, 工学研究科, 名誉教授 (20151368)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000)
Fiscal Year 2015: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2014: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2013: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
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| Keywords | 相平衡 / 相変態 / CALPHAD / 鉄鋼材料 / 組織制御 / 状態図 / 熱力学 / 金属間化合物 / 整合・非整合 |
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| Outline of Final Research Achievements |
Fe-Mn and Fe-Ni alloys, which are important systems for steel materials, were powdered by a gas-atomize method. Then, the powder samples were severely deformed by a converge milling process and heat-treated at temperatures between 700℃ and 450℃ (below the melting point of pure iron) to obtain the γ(fcc)+α(bcc) microstructure. Equilibrium compositions of the γ and α phases at low temperatures were measured by FE-EPMA. As a result, it is suggested that the solubility of Mn and Ni in the αFe at temperatures below 600℃ is larger than that in the literature. Similar experiments were performed on the Fe-Al binary alloys to obtain A2/B2/D03 order-disorder immiscible microstructures. As a result, it is suggested that equilibrium compositions among A2, B2 and D03 phases depend on the coherency at the inter-phase boundaries. Al-rich portion of the phase diagram of the Fe-Al binary system was also determined in this research subject.
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Report
(4 results)
Research Products
(10 results)
