2020 Fiscal Year Final Research Report
Metallurgy of precipitation aiming at ductility enhancement: Fabrication and characterization of core-shell structured particle dispersion steels
| Project/Area Number |
17H01333
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 | Kyushu University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
諸岡 聡 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 物質科学研究センター, 研究副主幹 (10534422)
大橋 鉄也 北見工業大学, 工学部, 特任教授 (80312445)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | 鉄鋼材料 / 機械的性質 / 組織制御 / 析出物 / 相変態 / 加工硬化 / 延性破壊 |
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| Outline of Final Research Achievements |
As a new guideline for the creation of high-strength steel with excellent workability, we proposed a microstructure control method for dispersing precipitated particles having a core-shell structure. In other words, the idea is to arrange a hard phase in the center of the particle to add a high strength and retard a fracture by the surrounding soft phase. Three types of core-shell structured particle dispersion reinforced steels were actually produced and their mechanical properties were evaluated. Among them, it was confirmed that an excellent strength-ductility balance can be obtained for Mn-containing steel in which martensite is arranged inside and austenite is arranged around it.
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| Free Research Field |
構造材料工学
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| Academic Significance and Societal Importance of the Research Achievements |
自動車の軽量化による燃費低減と、衝突時の安全性を確保するには、使用される鉄鋼材料の高強度化が不可欠となる。しかしながら、高強度化のみでは複雑な形状の部材を作製することはできず、鉄鋼材料には高強度のみならず優れた加工性という相反する特性が付与されなければならない。本研究では、コア-シェル構造粒子という特殊な金属組織を組み込むことでトレード-オフの関係にある両特性を同時に向上させようとする独自の試みを行ったものである。
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