2010 Fiscal Year Final Research Report
Establishment of Prediction Method of Nano-size Precipitates Sequences at High Temperatures for Long Term
| Project/Area Number |
20760476
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Structural/Functional materials
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
TODA Yoshiaki National Institute for Materials Science, 新構造材料センター, 主任研究員 (60343878)
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| Project Period (FY) |
2008 – 2010
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| Keywords | オーステナイト系耐熱鋼 / M_<23>C_6炭化物 / σ相 / 等温変態曲線 / 組織自由エネルギー / 化学的自由エネルギー / 弾性歪エネルギー / 界面エネルギー |
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| Research Abstract |
The system free energy method was applied to prediction of the precipitation of M_<23>C_6 carbide and sigma phase within grains in 18Cr-8Ni austenitic steels. The chemical free energy, the interfacial energy and elastic strain energy were estimated for the system free energy hierarchies of various microstructures. From the mini-mum-energy path, the precipitation initiation curves of both precipitates were theoretically predicted. The calculated curves agreed well with experimental results for Type 304H steels ; this suggests that system free energy method is suitable for predicting the evolution of microstructures in heat-resistant steels.
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