Impact Toughness of Medium‐Mn Transformation‐Induced Plasticity‐Aided Steels

DOI Web Site Web Site 被引用文献3件
  • Koh‐ichi Sugimoto
    Department of Mechanical Systems Engineering Shinshu University 4‐17‐1 Wakasato Nagano 380‐8553 Japan
  • Hikaru Tanino
    Department of Mechanical Systems Engineering Shinshu University 4‐17‐1 Wakasato Nagano 380‐8553 Japan
  • Junya Kobayashi
    Department of Mechanical Engineering Ibaraki University 4‐12‐1 Nakanarusawa‐cho Hitachi 316‐8511 Japan

書誌事項

公開日
2015-04-02
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/srin.201400585
公開者
Wiley

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説明

<jats:sec><jats:label/><jats:p>The impact toughness of 0.2% C–1.5% Si–(1.5–5.0)% Mn (mass%) transformation‐induced plasticity (TRIP)‐aided steels with bainitic ferrite and/or martensite structure matrices produced by isothermal transformation process is investigated for automotive body applications. The highest impact toughness, highest Charpy impact absorbed value (CIAV) at 298 K (130 J cm<jats:sup>−2</jats:sup>), and lowest ductile–brittle transformation temperature (DBTT, 203 K) is achieved in 1.5% Mn steel subjected to an isothermal transformation process at a temperature below the martensite start temperature M<jats:sub>S</jats:sub> − (50–100) K. An increase in the Mn content results in a small decrease in the CIAV (5–40 J cm<jats:sup>−2</jats:sup>) and an increase in the DBTT (20 K). The highest CIAV of 1.5% Mn steel compared with steels containing higher Mn content is mainly caused by (i) a more softened matrix structure consisting of wide lath‐martensite and bainitic ferrite, (ii) a smaller amount of the narrow‐lath martensite‐retained austenite‐like phase, and (iii) more stable retained austenite. The lowest DBTT of 1.5% Mn steel compared with the other steel compositions is mainly associated with the low Mn concentration of the matrix in this steel.</jats:p></jats:sec>

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