2022 Fiscal Year Final Research Report
Damage mechanism analysis of third generation ultra-high strength steels using combining method of synchrotron X-ray and finite element simulation, and its extension to inverse problem analysis
| Project/Area Number |
20H02484
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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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| Review Section |
Basic Section 26050:Material processing and microstructure control-related
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| Research Institution | Tottori University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
松田 知子 地方独立行政法人鳥取県産業技術センター, 無機材料グループ, 主任研究員 (00587644)
北條 智彦 東北大学, 金属材料研究所, 助教 (50442463)
渡邊 育夢 国立研究開発法人物質・材料研究機構, 構造材料研究拠点, 主幹研究員 (20535992)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | TRIP鋼 / 微視的解析 / 放射光 / 有限要素法 |
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| Outline of Final Research Achievements |
This research project elucidated deformation and damage mechanism of high-strength TRIP steels used for automobile crash component parts. It has been a task for TRIP steel applications that deformation localization sites subjected to easy fracture. A newly developed tensile testing method combining numerical analysis and measurement, as well as nondestructive analysis of internal forces and metallographic microstructure during tensile deformation conducted at SPring-8, revealed that the cause is the unstable development of the internal hard microstructure under deformation localization, which induces strong internal tensile forces.
Furthermore, three-dimensional microstructural observation was conducted to obtain numerical model based on the actual microstructure. After that, finite element simulations were performed based on this model. This simulation found that tensile forces were localized around the hard phase among the metallographic microstructure.
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| Free Research Field |
金属材料の変形と破壊
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| Academic Significance and Societal Importance of the Research Achievements |
本研究成果は今まで不明であったTRIP鋼の変形特性を明らかにできたとの学術的意義，そして新たな自動車用超高強度鋼材とその加工方法の開発シーズを与えるという社会的意義を有する．TRIP鋼は変形集中を抑制するはずであると長らく信じられており，これに対してはっきりとした答えを導けた意義は大きい．シミュレーションを活用することで，材料の開発と材料に合わせた加工方法の双方を一貫して最適化可能なシステムの足掛かりも構築することができた．実現すれば，自動車の安全性向上に加え，部材の薄肉化による軽量化や加工時間の革新的な短縮を図ることができる．カーボンニュートラル社会への土台作りとして貢献できるものと考える．
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