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Development of grain refinement method using recrystallization control during FSW

Research Project

Project/Area Number 20K05168
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 26050:Material processing and microstructure control-related
Research InstitutionNational Institute for Materials Science

Principal Investigator

NAGIRA Tomoya  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 (00379124)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords摩擦攪拌接合 / 動的再結晶 / 積層欠陥エネルギー / 微細化機構 / 溶接技術 / 焼鈍双晶 / 再結晶 / 組織形成 / 双晶
Outline of Research at the Start

本研究では、超強加工プロセスの一種である摩擦攪拌接合により面心立方格子(fcc)型の金属材料であるAl、Cu、Agを対象に、申請者が独自に見出した再結晶を完全に抑制できる現象の解明を通して、微細組織形成に影響を及ぼす支配因子(動的再結晶、双晶の形成、結晶粒の粗大化)を特定する。得られた知見を基に、新たな摩擦攪拌接合における再結晶制御による微細組織形成手法の確立を目指す。

Outline of Final Research Achievements

In this study, grain refinement mechanisms during friction stir welding (FSW) for the FCC metals (Ag, Cu, and Cu-30Zn) with low-to-medium stacking fault energies were examined to develop the technique for the microstructural control from the aspect of discontinuous dynamic recrystallization and annealing twinning. It was found that the mechanism for grain structure development and grain size were determined by the ratio of peak temperature during FSW to the recrystallization temperature.

Academic Significance and Societal Importance of the Research Achievements

一般に構造物全体の特性は、主に最弱部である溶接部によって決まるため、本研究で対象とする摩擦攪拌接合は、溶接部の結晶粒微細化によって機械的特性の向上が期待できる有効な接合法である。得られた成果は、積層欠陥エネルギーが小から中程度の面心立方型の金属全般の組織制御指針の提案に繋がるため、広範な応用が期待できる。摩擦攪拌接合を利用した長寿命な構造体を作製するための接合技術の確立として大きな意義がある。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (18 results)

All 2022 2021 2020

All Journal Article (7 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 7 results,  Open Access: 2 results) Presentation (11 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results)

  • [Journal Article] Microstructures and Tensile Properties of Friction Stir Welded 0.2%C-2%Si-Cr Steels2022

    • Author(s)
      伍 沢西, 柳楽 知也, 潮田 浩作, 宮本 吾郎, 藤井 英俊
    • Journal Title

      Tetsu-to-Hagane

      Volume: 108 Issue: 12 Pages: 911-925

    • DOI

      10.2355/tetsutohagane.TETSU-2022-038

    • ISSN
      0021-1575, 1883-2954
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Microstructural evolutions of 2N grade pure Al and 4N grade high-purity Al during friction stir welding2021

    • Author(s)
      T. Nagira, X.C. Liu, K. Ushioda and H. Fujii
    • Journal Title

      Materials

      Volume: 14 Issue: 13 Pages: 3606-3606

    • DOI

      10.3390/ma14133606

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Microstructures and tensile properties of friction stir welded 0.2%C?Si?Mn steel2021

    • Author(s)
      Wu Zexi、Nagira Tomoya、Ushioda Kohsaku、Miyamoto Goro、Fujii Hidetoshi
    • Journal Title

      Materials Science and Engineering: A

      Volume: 799 Pages: 140068-140068

    • DOI

      10.1016/j.msea.2020.140068

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Mechanism of grain structure development for pure Cu and Cu-30Zn with low stacking fault energy during FSW2020

    • Author(s)
      Nagira T.、Liu X.C.、Ushioda K.、Fujii H.
    • Journal Title

      Science and Technology of Welding and Joining

      Volume: 25 Issue: 8 Pages: 669-678

    • DOI

      10.1080/13621718.2020.1818032

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Time-resolved X-ray imaging of solidification cracking for Al-Cu alloy at the weld crater2020

    • Author(s)
      Nagira T.、Yamashita D.、Kamai M.、Liu H.、Aoki Y.、Fujii H.、Uesugi K.、Takeuchi A.
    • Journal Title

      Materials Characterization

      Volume: 167 Pages: 110469-110469

    • DOI

      10.1016/j.matchar.2020.110469

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Friction Stir Welding of High Phosphorus Weathering Steel– Weldabilities, Microstructural Evolution and Mechanical Properties2020

    • Author(s)
      Kawakubo Takumi、Nagira Tomoya、Ushioda Kohsaku、Fujii Hidetoshi
    • Journal Title

      Tetsu-to-Hagane

      Volume: 106 Issue: 12 Pages: 892-901

    • DOI

      10.2355/tetsutohagane.TETSU-2020-057

    • NAID

      130007946194

    • ISSN
      0021-1575, 1883-2954
    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effect of Stacking Fault Energy on the Grain Structure Evolution of FCC Metals During Friction Stir Welding2020

    • Author(s)
      Liu Xiaochao、Sun Yufeng、Nagira Tomoya、Ushioda Kohsaku、Fujii Hidetoshi
    • Journal Title

      Acta Metallurgica Sinica (English Letters)

      Volume: 33 Issue: 7 Pages: 1001-1012

    • DOI

      10.1007/s40195-020-01064-6

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 制振ダンパー用鋼材の接合技術とその周辺技術2022

    • Author(s)
      柳樂知也
    • Organizer
      第16回鉄鋼材料と鋼構造に関するシンポジウム
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 制振ダンパー用Fe-Mn-Si系合金の摩擦攪拌接合2022

    • Author(s)
      柳樂知也、Nikulin Ilya、中村照美、澤口孝宏、森貞好昭、森正和、藤井英俊
    • Organizer
      日本鉄鋼協会春季(第183回)講演大会シンポジウム
    • Related Report
      2021 Research-status Report
  • [Presentation] 高空間分解X線イメージングを利用したFe-Mn-Si系合金における溶接凝固現象のその場観察2021

    • Author(s)
      柳樂知也、中村照美、吉中奎貴、澤口孝宏、劉恢弘、青木祥宏、釜井正善、藤井英俊
    • Organizer
      溶接学会2021年度秋季全国大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 耐候性厚鋼板の線形摩擦接合2021

    • Author(s)
      川久保拓海、潮田浩作、藤井英俊、柳樂知也、中村照美
    • Organizer
      溶接学会2021年度秋季全国大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 摩擦攪拌接合を前提として開発した高P添加の耐候性鋼の靭性評価2020

    • Author(s)
      川久保拓海、柳楽知也、潮田浩作、藤井英俊
    • Organizer
      溶接学会2020年度春季全国大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 高純度Alの摩擦攪拌接合中における微細組織形成の解明2020

    • Author(s)
      柳楽知也、劉小超、潮田浩作、藤井英俊
    • Organizer
      溶接学会2020年度春季全国大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 摩擦攪拌接合したSi-Mn炭素鋼の組織と機械的性質に及ぼすMoおよびV添加の影響2020

    • Author(s)
      伍沢西、柳楽知也、潮田浩作、藤井英俊
    • Organizer
      溶接学会2020年度春季全国大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 低い積層欠陥エネルギーを有するfcc金属におけるFSW中の微細組織形成機構の解明2020

    • Author(s)
      柳樂知也, 劉小超, 潮田浩作, 藤井英俊
    • Organizer
      溶接学会2020年度秋季全国大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Micro-texture evolution of Ag with low stacking fault energy during friction stir welding2020

    • Author(s)
      T. Nagira, X.C. Liu, K. Ushioda, H. Fujii
    • Organizer
      The 19th International Conference on Texture of Materials (ITOCOM19)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 金属合金の凝固・変形のその場観察を利用した溶接・鋳造欠陥、組織形成機構の解明2020

    • Author(s)
      柳樂知也
    • Organizer
      日本金属学会2021年春期第168回講演大会
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Fe-18%Cr-Ni(8, 11, 14, 20%Ni)合金における準安定δ相の核生成によるマッシブ的δ-γ変態の選択2020

    • Author(s)
      西村友宏, 松林領汰, 森下浩平, 吉矢真人, 柳樂 知也, 安田秀幸
    • Organizer
      日本鉄鋼協会2021年春季講演大会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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