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Development of functional materials by ECAE and subsequent heat treatment

Research Project

Project/Area Number 17360350
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Material processing/treatments
Research InstitutionGraduate School of Engineering, Yokohama National University

Principal Investigator

AZUSHIMA Akira  Yokohama National University, Graduate School of Engineering, Professor, 大学院工学研究院, 教授 (30111462)

Co-Investigator(Kenkyū-buntansha) AOKI Koshiro  Shibaura Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (70262409)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥15,400,000 (Direct Cost: ¥15,400,000)
Fiscal Year 2006: ¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 2005: ¥9,900,000 (Direct Cost: ¥9,900,000)
KeywordsPlane Carbon steel / ECAE / Crystal grain / Grain refinement / Tensile strength / Ductility / Heat treatment / micro screw
Research Abstract

To obtain materials for micro screw which was high strengthened plane carbon steel with ductility, a cold ECAE (equal channel angular extrusion) process and following heat treatment were conducted. Grain refinement with grain size less than him was achieved by repeated ECAE process and tensile strength was increased. After ECAE process, low temperature, short time heat treatment, by which tensile strength become lower and total elongation increased, was carried out.
In FY 2005, SWCH18A (0.16%C with spheroidizing treatment) which is usually used as a material of screws and S15C were used in investigation. Both materials were ECAE processed to 4 passes via route C at room temperature. ECAE Processed specimens were annealed at 600 ℃ in several periods, then ductility were improved. Manufacturing micro screw was conducted to specimen after heat treated and succeed in producing micro screw.
In FY 2006, Different carbon contained steels, S25C, S35C and S45C were selected. Materials were ECAE processed to 4 passes via route C at room temperature. ECAE Processed specimens were annealed at 600 ℃ in several periods, then ductility were improved. Producing micro screw was conducted by the cold header, that was design to manufacture micro screw, made by nakashimada co. ltd.
The results of producing micro screw, whether it was possible or not, was used for judging of formability in enhanced materials fabricated by deformation and heat treatments. These obtained knowledge were reflected in the optimization for combination of thermo-mechanical process.

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (6 results)

All 2007 2006 2005

All Journal Article (6 results)

  • [Journal Article] Development and properties of high strengthened carbon steels produced by repetitive extrusion and heat treatment process2007

    • Author(s)
      K.Aoki, A.Azushima
    • Journal Title

      Proc. Thermec 2006 MATERIALS SCIENCE FORUM 539-543

      Pages: 2884-2891

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Development and properties of high strengthened carbon steels produced by repetitive extrusion and heat treatment process2007

    • Author(s)
      K.Aoki, A.Azushima
    • Journal Title

      Proc.Thermec 2006 MATERIALS SCIENCE FORUM 539-543

      Pages: 2884-2891

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] ECAE加工を施した炭素鋼を用いたマイクロボルトの創製2006

    • Author(s)
      上甲和文, 柳田明, 小豆島明
    • Journal Title

      第57回塑性加工連合講演会

      Pages: 309-310

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Manufacture of micro-bolt using plane carbon steels fabricated by ECAE process (in Japanese)2006

    • Author(s)
      K.Joko, A.Yanagida, A.Azushima
    • Journal Title

      Proc.2006 Jpn.Spring Conf.Techn.Plasticity

      Pages: 309-310

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] AZ31の温間ECAE加工プロセスの最適化2005

    • Author(s)
      平嶋直人, 小豆島明, 青木孝史朗
    • Journal Title

      平成17年度塑性加工春季講演会講演論文集

      Pages: 305-306

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Mechanical Properties of Repetitive Side Extruded and Heat Treated 0.5% Carbon Steel2005

    • Author(s)
      K.AOKI
    • Journal Title

      Advanced Technology of Plasticity 2005

      Pages: 441-441

    • Related Report
      2005 Annual Research Report

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Published: 2005-04-01   Modified: 2016-04-21  

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