| Project/Area Number |
16K14430
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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 |
Suzuki Shigeru 東北大学, 多元物質科学研究所, 教授 (40143028)
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| Co-Investigator(Kenkyū-buntansha) |
佐藤 成男 茨城大学, 理工学研究科(工学野), 教授 (40509056)
小貫 祐介 茨城大学, フロンティア応用原子科学研究センター, 産学官連携助教 (50746998)
藤枝 俊 大阪大学, 工学研究科, 准教授 (60551893)
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | 電磁ステンレス鋼 / 析出 / 集合組織 / 時効析出 / ナノ析出 / 透磁率 / ステンレス鋼 / 析出強化 / 加工・熱処理 / 集合組織制御 |
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| Outline of Final Research Achievements |
The effect of alloying elements Ni and Al on the mechanical properties of precipitation-hardened soft-magnetic stainless steels was investigated. Thermodynamic calculations suggested that the aging treatments led to precipitation of NiAl compounds with B2 structure and Fe2Mo-type Laves phases. By changing the concentration of the alloying elements, the B2-type NiAl precipitates were mainly responsible for the precipitation hardening, and the Vickers hardness was hardly affected by the Mo content. Small-angle X-ray scattering analysis was used to determine the size and number density of the fine precipitates, which contributed to the hardening. The high-density NiAl precipitates grew to a few nanometers in radius after an adequate period of aging. It was indicated that grains with the <100> texture component preferentially evolve during compressive deformation under low strain rates at higher temperatures. The optimum conditions for the <100> texture evolution are proposed.
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| Academic Significance and Societal Importance of the Research Achievements |
電磁ステンレス鋼には、耐食性以外に、高い強度や軟磁性特性が求められる。そうした複合的特性を学術的に取り組んだ研究は少なかった。本研究では、それらの特性を向上させるために、合金の化学組成やプロセスは、実験室レベルで研究を行ってきた。こちらの知見は、工業的な実際のアクチュエータ等の製造でも活用される可能性があり、社会的な意義も大きい。
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