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Accelerated grain refinement induced by dispersed coarse particles

Research Project

Project/Area Number 18560674
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural/Functional materials
Research InstitutionThe University of Electro-Communications

Principal Investigator

MIURA Hiromi  The University of Electro-Communications, Faculty of Electro-Communications, Associate Professor (30219589)

Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,780,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥180,000)
Fiscal Year 2007: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2006: ¥3,000,000 (Direct Cost: ¥3,000,000)
KeywordsSevere plastic deformation / multi-directional forging / hot deformation / stimulation / grain refinement / Ni-Fe alloy / coarse particle / Ni-Fe合金 / 粗大粒子 / 微細化促進
Research Abstract

A Ni-30 mass% Fe alloy with dispersed coarse oxide particles, ranging from 1 to 3 μm in diameter, was multi-directionally forged (MDF) at temperatures between 773 K and 873 K at a true strain rate of 1 × 10^<-3> s^<-1> in vacuum. For comparison, a particle-free Ni-Fe alloy was also prepared and MDFed. At 873 K, an obvious flow softening occurred during MDF especially in the alloy with dispersed particles, while work hardening followed by steady-state flow appeared at 773 K in both alloys. With increasing cumulative strain, the average grain size became gradually finer. However, the evolved microstructure was quite different depending on temperature and dispersion of particles. At 873 K, in the alloy with particles, equi-axed fine grains of about 1.3 μm in average was uniformly evolved at a cumulative strain ofΣε=2.4, while at 773 K the microstructure was still inhomogeneous. The above experimental results suggest important role of coarse particles to stimulate grain refinement.

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (7 results)

All 2007

All Journal Article (4 results) (of which Peer Reviewed: 2 results) Presentation (3 results)

  • [Journal Article] stimulated Grain Refinement in Ni-Fe Alloy by Coarse Particles during Warm Multi-Directional Forging2007

    • Author(s)
      H. Miura, et al.
    • Journal Title

      Materials Science Forum Vol. 550

      Pages: 271-276

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Stimulated Grain Refinement in Ni-Fe Alloy by Coarse Particles, during Warm Multi-Directional Forging2007

    • Author(s)
      H. Miura, T. Sakai, T. Ueno, N. Fujita, N. Yoshinaga
    • Journal Title

      Materials Science Forum Vol. 550

      Pages: 271-276

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Stimulated Grain Refinement in Ni-Fe Alloy by Coarse Particles during Warm Multi-Directional Forging2007

    • Author(s)
      H. Miura, et. al.
    • Journal Title

      Materials Science Forum Vol.550

      Pages: 271-276

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Stimulated grain refinement in Ni-Fe alloy by coarse particles during warm multi-directional forging2007

    • Author(s)
      H.Miura, T.Sakai, T.Ueno, N.Fujita, N.Yoshinaga
    • Journal Title

      Materials Science Forum 550

      Pages: 271-276

    • Related Report
      2006 Annual Research Report
  • [Presentation] 温間多軸鍛造中の粗大分散粒子によるNi-Fe合金の結晶粒超微細化の促進2007

    • Author(s)
      三浦博己, 他4名
    • Organizer
      日本鉄鋼協会
    • Place of Presentation
      岐阜大学
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] 分散強化型Ni-Fe合金の温間強ひずみ加工と結晶粒微細化2007

    • Author(s)
      上野太郎, 他4名
    • Organizer
      日本鉄鋼協会
    • Place of Presentation
      千葉工業大学
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Accelerated Evolution of Ultrafine Grains by Coarse Particles during Multi-Directional Forging of Ni-Fe alloy2007

    • Author(s)
      H. Miura, T. Ueno, T. Sakai, N. Fujita, N. Yoshinaga
    • Organizer
      Annual meeting of Institute of Steel and Iron of Japan
    • Place of Presentation
      Gifu, Japan.
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2006-04-01   Modified: 2016-04-21  

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