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Development of Mechanical Properties in Dual Phase Steels by Percolation Control

Research Project

Project/Area Number 15K06488
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Structural/Functional materials
Research InstitutionTokyo Institute of Technology

Principal Investigator

Nakada Nobuo  東京工業大学, 物質理工学院, 准教授 (50380580)

Project Period (FY) 2015-04-01 – 2018-03-31
Project Status Completed (Fiscal Year 2017)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywords構造材料 / 組織連結性 / パーコレーション / マルテンサイト変態 / 鉄鋼材料
Outline of Final Research Achievements

For an essential understanding the microstructural factors dominating mechanical properties of metals with duplex microstructure in a meso scale, a change in 0.2% proof stress depending upon hard austenite fraction was investigated in terms of a microstructural connectivity using Fe-Ni austenitic alloy having a duplex microstructure composed of soft and hard austenite. 0.2% proof stress is continuously increased with increasing the fraction of the hard austenite. Especially, it is efficiently increased according to iso-strain condition when the hard austenite fraction exceeds a critical value. The non-linear strengthening tends to have good correlation with a connectivity of the hard austenite, that is, percolation phenomenon. This suggests that when the hard austenite grains are firmly connected to each other, plastic strain is uniformly distributed between soft and hard austenite during deformation, which leads to a significant strengthening in metals with duplex microstructure.

Report

(4 results)
  • 2017 Annual Research Report   Final Research Report ( PDF )
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (8 results)

All 2017 2016

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 3 results,  Acknowledgement Compliant: 1 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results)

  • [Journal Article] Matrix switch related to microstructural connectivity and its effect on strength in metals with duplex microstructure2017

    • Author(s)
      Nakada Nobuo、Kawasaki Shouhei、Kogakura Yuuki、Tsuchiyama Toshihiro、Takaki Setsuo
    • Journal Title

      Materials Science and Engineering: A

      Volume: 690 Pages: 270-276

    • DOI

      10.1016/j.msea.2017.03.002

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Direct observation of martensitic reversion from lenticular martensite to austenite in Fe-Ni alloy2017

    • Author(s)
      Nakada Nobuo
    • Journal Title

      Materials Letters

      Volume: 187 Pages: 166-169

    • DOI

      10.1016/j.matlet.2016.10.056

    • Related Report
      2017 Annual Research Report 2016 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Self-stabilization of untransformed austenite by hydrostatic pressure via martensitic transformation2016

    • Author(s)
      Nobuo Nakada, Yuji Ishibashi, Toshihiro Tsuchiyama, Setsuo Takaki
    • Journal Title

      Acta Materiala

      Volume: 110 Pages: 95-102

    • DOI

      10.1016/j.actamat.2016.03.048

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Presentation] Self-stabilization of Untransformed Austenite by Hydrostatic Pressure via Martensitic Transformation2017

    • Author(s)
      Nakada Nobuo、Ishibashi Yuji、Tsuchiyama Toshihiro、Takaki Setsuo
    • Organizer
      INTERNATIONAL CONFERENCE ON MARTENSITIC TRANSFORMATIONS 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 複合組織鋼の強度に及ぼす組織連結性の影響2017

    • Author(s)
      中田伸生, 川崎翔平, 小ヶ倉勇樹, 土山聡宏, 高木節雄
    • Organizer
      日本鉄鋼協会第173回春季講演大
    • Related Report
      2017 Annual Research Report 2016 Research-status Report
  • [Presentation] マルテンサイト変態に起因した 静水圧応力による 未変態オーステナイトの自己安定化2017

    • Author(s)
      中田伸生
    • Organizer
      第12回SPring-8金属材料評価研究会/第11回SPring-8先端利用技術ワークショップ
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] 複相組織合金の力学特性に及ぼす組織連結性の影響2016

    • Author(s)
      中田伸生、小ヶ倉勇樹、尾中晋、川崎翔平、土山聡宏、高木節雄
    • Organizer
      鉄鋼インフォマティクス研究会 第七回研究会
    • Place of Presentation
      キャンパス・イノベーションセンター東京
    • Year and Date
      2016-01-29
    • Related Report
      2015 Research-status Report
    • Invited
  • [Presentation] Fe-Ni合金におけるマルテンサイト逆変態の高温EBSD観察2016

    • Author(s)
      中田伸生
    • Organizer
      日本鉄鋼協会第172回秋季講演大会
    • Place of Presentation
      大阪大学
    • Related Report
      2016 Research-status Report

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Published: 2015-04-16   Modified: 2019-03-29  

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