2019 Fiscal Year Final Research Report
Development for new generation laminated high-strength steel
| Project/Area Number |
17K14844
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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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 | Tottori University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | Dual Phase steel / メゾスケール解析 / 異方性 / 鋼材強度 |
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| Outline of Final Research Achievements |
The study considered morphology of micro structure in high strength steels for high bending strength. Dual phase steels, which are composed of hard island-shaped phase embedded in soft phase matrix, was focused. Due to the difference for actual sample preparation that include hard phases with desired morphology, virtual material development and mechanical test on the computer were conducted. High bending strength which was intended in this study required strong anisotropy of tensile response; and the virtual material tests clarified that the fibrous hard phase induced such strong anisotropy. This strong anisotropy expressed up to 10 % material deformation, and diminished after the 10 % material deformation.
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| Free Research Field |
鉄鋼材料の塑性変形，延性破壊，および塑性加工
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| Academic Significance and Societal Importance of the Research Achievements |
鋼材の曲げ強度は自動車用部材において重要な役割を果たす．強度が高ければその分だけ鋼材の厚さを減らせるので，耐衝突性能を維持しながら軽量化を果たすことが可能となる．本課題における研究成果は，これまでにない異方性を活用しての曲げ強度向上の糸口を得ることができたという点において社会的な意義があるものと考える．
また，鋼材の微視的な構造による異方性の発現が極めて複雑におけるという点が新たに明らかとなった．これらを調整，最適化していくことで曲げ強度向上のブレイクスルーを得る可能性がある．新たな研究テーマの広がりとして学術的な意義があったものと考える．
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