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2005 Fiscal Year Final Research Report Summary

Effects of Ion Irradiation on Laser Welded V-4Cr-4Ti Alloy

Research Project

Project/Area Number 15560717
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

WATANABE Hideo  Kyushu University, RIAM, Associate Professor, 応用力学研究所, 助教授 (90212323)

Co-Investigator(Kenkyū-buntansha) YOSHIDA Naoaki  Kyushu Uniersity, RIAM, Professor, 教授 (00127317)
Project Period (FY) 2003 – 2005
KeywordsLow activation alloy / Vanadium alloy / Electron Microscopy / Titanium oxides / Laser Welding / Ion Irradiation / Neutron Irradiation
Research Abstract

High purity V-4Cr-4Ti alloy, fabricated by National Institute for Fusion Science (NIFS), was used for this study. The samples were annealed at 1273K for 2 hours and bead-on-plate welds were performed using high purity argon gas. A 2.4MeV copper ion irradiation was carried out with the tandem accelerator at Kyushu University. The TEM samples were sliced from the welded materials and irradiated at 573K and 873K up to the dose of 12 dpa. The microstructure before irradiation showed that relatively large Ti(C, O, N) precipitates which were commonly observed in V-4Cr-4Ti alloy disappeared in the center of weld metal. After the ion irradiation at 873K, fine titanium oxides with {100} habit plane were detected at the dose of 0.75 dpa. Lower number density of the oxides was observed in the base metal after the same irradiation conditions. This means that the contribution of oxygen atoms, which dissolved from the large precipitates during the laser welding, is essential to the microstructural evolution of welded V-4Cr-4Ti alloys.

  • Research Products

    (9 results)

All 2005 2004 Other

All Journal Article (9 results)

  • [Journal Article] Recovery of Hardness, Impact Properties and Microstructure of Neutron-Irradiated Weld Joint of a Fusion Candidate Vanadium Alloy2005

    • Author(s)
      T Nagasaka et al.
    • Journal Title

      Material Transactions 46

      Pages: 498-502

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] The Microstructure of Laser Weld V-4Cr-4Ti Alloy After Ion Irradiation2005

    • Author(s)
      H.Watanabe et al.
    • Journal Title

      Material Science Forum Vol.475-479

      Pages: 1491-1496

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Recovery of Hardness, Impact Properties and Microstructure of Neutron-Irradiated Weld Joint of a Fusion Candidate Vanadium Alloy2005

    • Author(s)
      T.Nagasaka et al.
    • Journal Title

      Material Transactions Vol.46, No.3

      Pages: 498-502

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] The Microstructure of Laser Weld V-4Cr-4Ti Alloy(NIFS-HEAT2) After Ion Irradiation2004

    • Author(s)
      H.Watanabe et al.
    • Journal Title

      Journal of Plasma and Fusion Research Vol.80

      Pages: 889-894

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Impact Properties of NIFS-HEAT-2(V-4Cr-4Ti after) YAG Laser Welding and Neutron Irradiation at 563K2004

    • Author(s)
      T.Nagasaka et al.
    • Journal Title

      Journal of Nuclear Materials 329-333

      Pages: 1539-1543

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] The Precipitation Behavior of Ion Irradiated V-4Cr-4Ti Alloys at Various Oxygen Levels2004

    • Author(s)
      M.Hatakeyama et al.
    • Journal Title

      Journal of Nuclear Materials 329-333

      Pages: 420-424

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] The Study of Temperature Variation During HFIR Irradiation on Vanadium2004

    • Author(s)
      H.Watanabe et al.
    • Journal Title

      Journal of Nuclear Materials 329-333

      Pages: 420-424

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] The Microstructure of Laser Weld <V-4Cr-4Ti> Alloy After Neutron Irradiation

    • Author(s)
      H Watanabe et al.
    • Journal Title

      Journal of Nuclear Materials (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Advances in Development of Vanadium Alloys and MHD Insulator Coatings

    • Author(s)
      T Muroga et al.
    • Journal Title

      Journal of Nuclear Materials (印刷中)

    • Description
      「研究成果報告書概要(和文)」より

URL: 

Published: 2007-12-13  

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