| 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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| 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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