2017 Fiscal Year Final Research Report
Cu-modified Al2O3 scale forming austenitic heat resistant alloys
| Project/Area Number |
15H04153
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/Microstructural control engineering
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| Research Institution | Hokkaido University (2017)
Tokyo Institute of Technology (2015-2016) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
鵜飼 重治 北海道大学, 工学研究院, 特任教授 (00421529)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | Heat resistant steels / Alumina forming alloy / HT oxidation / Alloy design |
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| Outline of Final Research Achievements |
In this study, alumina scale forming austenitic heat resistant steels, which have better producibility, workability, and high-temperature oxidation resistance was proposed. Cu addition to austenitic heat resistant steels was found to stabilize the gamma-phase and suppress formation of intermetallic compounds such as beta-NiAl. Thus higher Al addition in steels can be acceptable, which is beneficial for both production and oxidation resistance by forming alumina-scale. From the interdiffusion study, copper was found to have negative interaction with aluminum in gamma-matrix, which enhanced aluminum outward diffusion toward the steel surface. This enhanced aluminum supply from the substrate were considered to promote an exclusive alumina scale formation. Copper addition to austenitic steels shows potential for development of new heat resistant steels.
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| Free Research Field |
耐熱合金、高温酸化、高温腐食
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