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Relationship during Micro Texture, Strength and Formability of Aluminum Alloy/Steel Laser Butt Tailored Welded Blanks

Research Project

Project/Area Number 20K05153
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 InstitutionKyoto Institute of Technology

Principal Investigator

Takashi Iizuka  京都工芸繊維大学, 機械工学系, 教授 (60335312)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords塑性加工 / 板材成形 / テーラードブランク / 異種金属接合 / レーザ接合 / 成形性 / 耐電界腐食性
Outline of Research at the Start

燃費向上や二酸化炭素排出量削減のための自動車の軽量化の方法として,板材成形の分野に目を向けるとテーラードブランク(Tailored Welded Blank: TWB)成形によるマルチマテリアル化が効果的である.しかしながら,軽金属板と鋼板の異種金属TWBは実用化されていない.特にアルミニウム合金板と鋼板のマルチマテリアル化に関しては,①難溶接性,②難成形性および③電界腐食の三つの課題が解決できていない.本研究ではアルミニウム合金/鋼の異種金属TWBの開発として,レーザを用いた突合せ接合板に関してこれら三つの課題の解決に向けて,強度と組織,成形性,耐電食性に関する評価と性能向上を行う.

Outline of Final Research Achievements

Aluminum alloy/steel tailor welded blanks(TWBs) is expected as future light-weighing materials. In this study, aluminum alloy/steel TWBs were fabricated using laser butt welding in order (1) to improve joint strength, (2) to evaluate sheet formability of them, and (3) to clarify resistance to galvanic corrosion. As for the aim (1), strength maps related to welding conditions and joint strength were created. In addition, correlation maps during welding conditions, joint strength and texture were also created. As for the aim (2), punch stretching tests and hole expansion test were conducted to TWBs, and relationships between joint strength and sheet formability were clarified. As for the aim (3), the combined cycle corrosion tests were conducted to TWBs. From the results, resistance to galvanic corrosion for each TWBs could be evaluated and some differences in degradation behavior of joint strength by welding methods were clarified.

Academic Significance and Societal Importance of the Research Achievements

異種金属テーラードブランクは将来的な軽量化材料として期待されているが,アルミニウム合金/鋼の系についてレーザ接合を用いた研究はほとんど行われていない.本研究で得られた成果は強度向上,成形性および耐電界腐食性に関するものであるが,まず接合法自体が新しいため得られた成果は全て学術的に試金石的なものとなると考えられる.特に成形性や耐腐食性に関しては,他の接合法も含めて新しいものであり,今後の二酸化炭素排出削減のための異種金属接合材の開発と利用の促進のために重要であり,社会的な意義も大きいと考えている.現状では課題が浮き彫りになった状況であるが,課題克服のヒントも得ることができたことは重要である.

Report

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

    (4 results)

All 2022 2021

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Combined-cycle corrosion testing of steel/6000 series aluminum alloys joined by friction welding2021

    • Author(s)
      Jin Jianchen、Iizuka Takashi
    • Journal Title

      ESAFORM 2021

      Volume: web

    • DOI

      10.25518/esaform21.3665

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] アルミニウム/鋼突合せレーザ接合材の強度,組織とレーザ出力 の関係2022

    • Author(s)
      金建晨,Doniddorj Bayarjargal,阪本大夢,飯塚高志
    • Organizer
      第73 回塑性加工連合講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] アルミニウム/鋼突合わせレーザ接合材の接合強度と金属間化合物層の状態2022

    • Author(s)
      金建晨,飯塚高志
    • Organizer
      2022年度塑性加工春季講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Combined-Cycle Corrosion Testing of Steel/6000 Series Aluminum Alloys Joined by Friction Welding2021

    • Author(s)
      Jianchen Jin
    • Organizer
      24th International Conference on Material Forming (ESAFORM 2021)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research

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

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