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Mechanical property and its application of steel sheets with strength gradient through sheet thickness direction

Research Project

Project/Area Number 20686047
Research Category

Grant-in-Aid for Young Scientists (A)

Allocation TypeSingle-year Grants
Research Field Structural/Functional materials
Research InstitutionKyushu University

Principal Investigator

TSUCHIYAMA Toshihiro  Kyushu University, 大学院・工学研究院, 准教授 (40315106)

Project Period (FY) 2008 – 2009
Project Status Completed (Fiscal Year 2009)
Budget Amount *help
¥19,110,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥4,410,000)
Fiscal Year 2009: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2008: ¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
Keywords強度勾配 / 加工用薄鋼板 / 強度傾斜鋼板 / ステンレス鋼 / 固相窒素吸収法 / 固溶強化 / 引張特性 / 曲げ加工 / 傾斜機能材料 / 固相窒素吸収処理 / 応力-歪み曲線 / プレス成形
Research Abstract

As a new approach to control mechanical properties of steel sheets for press forming, the effectiveness of changing material strength continuously through sheet thickness direction was investigated. In this study, nitrogen concentration distribution was controlled for stainless steel to obtain 'strength-gradient steel sheets' with a maximum strength at the surface or in the center of the sheet, and then the mechanical properties of these specimens were evaluated. As a result, the bending strength was found to be varied depending on the strength-gradient even when the tensile strength is identical. This suggests that it would be possible to improve mechanical properties of steel sheets for press forming by this method.

Report

(3 results)
  • 2009 Annual Research Report   Final Research Report ( PDF )
  • 2008 Annual Research Report
  • Research Products

    (18 results)

All 2010 2009 2008 Other

All Journal Article (7 results) (of which Peer Reviewed: 7 results) Presentation (9 results) Remarks (1 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Surface-layer microstructure control for metastable austenitic stainless steel to prevent hydrogen permeation2010

    • Author(s)
      T. TSUCHIYAMA, H. TAKEBE, K. TSUBOI, S. TAKAKI
    • Journal Title

      Scripta Materialia 62

      Pages: 731-734

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Surface-layer microstructure control for metastable austenitic stainless steel to prevent hydrogen permeation2010

    • Author(s)
      T.Tsuchiyama, H.Takebe, K.Tsuboi, S.Takaki
    • Journal Title

      Scripta Materialia 62

      Pages: 731-734

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effect of Solution Nitriding on Hardness and Microstructure of Martensitic Stainless Steel2009

    • Author(s)
      K.L. NGO HUYNH, H. TAKEBE, K. NAKASHIMA, T. TSUCHIYAMA, S. TAKAKI
    • Journal Title

      Journal of The Japan Society for Heat Treatment 49

      Pages: 549-552

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Relationship between Work Hardening Behavior and Deformation Structure in Ni-free High Nitrogen Austenitic Stainless Steels2009

    • Author(s)
      Y. TERAZAWA, T. ANDO, T. TSUCHIYAMA, S. TAKAKI
    • Journal Title

      steel research international 80

      Pages: 473-476

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] 固相窒素吸収法により製造した強度傾斜ステンレス鋼の機械的性質2009

    • Author(s)
      坪井耕一、井上良平、土山聡宏、高木節雄
    • Journal Title

      材料とプロセス 22

      Pages: 1142-1144

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fe-25%Cr合金線材の窒素吸収に伴う組織変化2009

    • Author(s)
      小野本達郎、土山聡宏、他
    • Journal Title

      熱処理 49

      Pages: 1-2

    • NAID

      10024935890

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Factors Inducing Intergranular Fracture in Nickel-free High Nitrogen Austenitic Stainless Steel Produced by Solution Nitriding2008

    • Author(s)
      T. Tsuchiyama, Y. Fujii, Y. Tera-zawa, K. Nakashima, S. Takaki
    • Journal Title

      ISIJ International 6

      Pages: 861-867

    • NAID

      10027029219

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Presentation] Concept of Microstructure-Gradient Stainless Steel and Its Application2010

    • Author(s)
      T.Tsuchiyama, S.Takaki
    • Organizer
      The 5^<th> KIMS-Kyushu University Joint Symposium on Steel Research
    • Place of Presentation
      Kyushu University
    • Year and Date
      2010-04-01
    • Related Report
      2009 Annual Research Report
  • [Presentation] Mechanical Property of Steel Sheets with Strength Gradient through Thickness Direction2009

    • Author(s)
      K.Tsuboi, T.Tsuchiyama, S.Takaki
    • Organizer
      18th Processing and Fabrication of Advanced Materials
    • Place of Presentation
      Tohoku University
    • Year and Date
      2009-12-12
    • Related Report
      2009 Annual Research Report
  • [Presentation] 板厚方向に強度勾配を有する薄鋼板の機械的性質2009

    • Author(s)
      坪井耕一
    • Organizer
      日本鉄鋼協会第157回春季講演大会
    • Place of Presentation
      東京工業大学
    • Year and Date
      2009-03-29
    • Related Report
      2008 Annual Research Report
  • [Presentation] Mechanical Property of Steel Sheets with Strength Gradient through Thickness Direction2009

    • Author(s)
      K. TSUBOI, T. TSUCHIYAMA, S. TAKAKI
    • Organizer
      18th Processing and Fabrication of Advanced Materials
    • Place of Presentation
      Sendai
    • Related Report
      2009 Final Research Report
  • [Presentation] 板厚方向に強度勾配を有する薄鋼板の機械的性質2009

    • Author(s)
      坪井耕一、寺澤祐介、安東知洋、土山聡宏、高木節雄
    • Organizer
      日本鉄鋼協会春季講演大会、ポスターセッション
    • Place of Presentation
      東京工業大学
    • Related Report
      2009 Final Research Report
  • [Presentation] 固相窒素吸収法により製造した強度傾斜ステンレス鋼板の機械的性質2009

    • Author(s)
      坪井耕一、井上良平、土山聡宏、高木節雄
    • Organizer
      日本鉄鋼協会秋季講演大会
    • Place of Presentation
      京都大学
    • Related Report
      2009 Final Research Report
  • [Presentation] Effect of Solution Nitriding on Hardness and Microstructure of Martens itic Stainless Steel2008

    • Author(s)
      H. K. L. Ngo
    • Organizer
      17^<th> IFHTSE Congress 2008
    • Place of Presentation
      神戸国際会議場
    • Year and Date
      2008-10-28
    • Related Report
      2008 Annual Research Report
  • [Presentation] SUS410への固相窒素吸収法の適用とその有効性2008

    • Author(s)
      ゴフィンキンルアン
    • Organizer
      日本鉄鋼協会第156回秋季講演大会
    • Place of Presentation
      熊本大学
    • Year and Date
      2008-09-24
    • Related Report
      2008 Annual Research Report
  • [Presentation] 固相窒素吸収処理と冷間圧延による準安定オーステナイト鋼の傾斜組織制御2008

    • Author(s)
      岳辺秀徳
    • Organizer
      日本鉄鋼協会第156回秋講演大会
    • Place of Presentation
      熊本大学
    • Year and Date
      2008-09-24
    • Related Report
      2008 Annual Research Report
  • [Remarks]

    • URL

      http://takaki.zaiko.kyushu-u.ac.jp/

    • Related Report
      2009 Final Research Report
  • [Patent(Industrial Property Rights)] マルテンサイト系ステンレス鋼の耐食性と強度の改善方法2008

    • Inventor(s)
      土山聡宏, 他
    • Industrial Property Rights Holder
      九州大学, 他
    • Industrial Property Number
      2008-313166
    • Filing Date
      2008-11-27
    • Related Report
      2009 Final Research Report

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Published: 2008-04-01   Modified: 2016-04-21  

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