Deformation Mechanism of Nanostructured Dual Phase Steels Composed of Soft and Hard Phases ~ control of mechanical properties based on heterogeneity
| Project/Area Number |
20H00306
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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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| Review Section |
Medium-sized Section 26:Materials engineering and related fields
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
足立 大樹 兵庫県立大学, 工学研究科, 教授 (00335192)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥45,500,000 (Direct Cost: ¥35,000,000、Indirect Cost: ¥10,500,000)
Fiscal Year 2022: ¥12,740,000 (Direct Cost: ¥9,800,000、Indirect Cost: ¥2,940,000)
Fiscal Year 2021: ¥13,910,000 (Direct Cost: ¥10,700,000、Indirect Cost: ¥3,210,000)
Fiscal Year 2020: ¥18,850,000 (Direct Cost: ¥14,500,000、Indirect Cost: ¥4,350,000)
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| Keywords | 金属材料 / 力学特性 / 変形中その場中性子回折 / 不均一ナノ組織 / デジタル画像相関法 / 不均一変形 / 強度 / 延性 / 引張変形中放射光その場回折 / 鉄鋼材料 / 画像相関法 / 放射光その場回折 / 変形中放射光その場回折 |
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| Outline of Research at the Start |
軟質な相・ドメインと硬質な相・ドメインがナノスケールで組み合わさった組織（ナノヘテロ組織）を有する金属材料がしばしば示す、高い強度と大きな延性を併せ持つ優れた力学特性の原因を、明らかにする。これまでに獲得した手法と知見を駆使し、フェライト＋マルテンサイト二相鋼ぼ組織のナノ化と分布状態等の制御を行う。デジタル画像相関法（DIC）や引張変形中のその場放射光X線回折といった先端的手法で解析する。
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| Outline of Final Research Achievements |
In order to clarify the reason why nano-hetero structured metallic materials composed of hard phase/domain and soft phase/domain sometimes can manage both high strength and good tensile ductility, experimental studies were conducted. We have succeeded in fabricating ferrite and martensite dual-phase (DP) steels with various average grain sizes by applying our originally developed heat treatment process to Fe-2Mn-0.1C alloys. Local strain analysis using the micro-DIC (digital image correlation) method was performed to determine the average plastic strain of each phase during tensile deformation, and in situ neutron diffraction during tensile tests was simultaneously performed to quantitatively elucidate the mechanical interaction between the two phases. Stress-strain responses of each phase in the DP steel could be identified for the first time, and we could clarify the mechanical interaction between soft phase and hard phase quantitatively.
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| Academic Significance and Societal Importance of the Research Achievements |
ナノヘテロ組織材料（ナノ二相鋼）の優れた加工硬化の本質と軟質・硬質相間の変形拘束の影響を初めて定量的に解明し、ナノヘテロ組織がなぜ全体として優れた力学挙動を示すのかを明らかにすることができた。これは複雑な組織（ヘテロ組織）を有する高強度金属材料の変形挙動を理解するための重要な基礎的知見を与える点で学術的に重要な知見である。また近年、自動車など輸送機器の燃費向上と地球温暖化ガスの排出削減などのため、構造用金属材料には超高強度と十分な延性・靭性が要求されているが、本研究の成果はそうした革新的構造材料を実現するためにも有益な知見を与え、安全な社会の構築にも資することができる。
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Report
(5 results)
Research Products
(87 results)
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[Journal Article] Unique transition of yielding mechanism and unexpected activation of deformation twinning in ultrafine grained high-Mn austenitic steel2021
Author(s)
Yu Bai, Hiroki Kitamura, Si Gao, Yanzhong Tian, Nokeun Park, Myeong-heom Park, Hiroki Adachi, Akinobu Shibata, Masugu Sato, Mitsuhiro Murayama, Nobuhiro Tsuji
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Journal Title
Scientific Reports
Volume: -
Issue: 1
Pages: 15870-15870
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] Unique transition of yielding behavior and deformation mechanism in ultrafine grained high-Mn austenitic steel2021
Author(s)
Y. Bai, H. Kitamura, S. Gao, Y.Z. Tian, N. Park, M-H Park, H. Adachi, A. Shibata, M. Sato, M. Murayama, N. Tsuji
Organizer
Materials Research Meeting (MRM) 2021
Related Report
Int'l Joint Research / Invited
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