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Irradiation

Research Project

Project/Area Number 23760822
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Nuclear engineering
Research InstitutionTohoku University

Principal Investigator

TOYAMA Takeshi  東北大学, 金属材料研究所, 講師 (50510129)

Project Period (FY) 2011 – 2013
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2011: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords析出物 / 3次元アトムプローブ / 中性子照射 / ステンレス鋼 / 照射損傷 / 微小析出物 / 国際研究者交流 / 照射欠陥 / ステンレス / 照射誘起析出
Research Abstract

Irradiation-induced precipitates/grain boundary segregation are one of the main origins for irradiation-induced degradation of a stainless steel. For instance, fine precipitates causes irradiation-induced hardening. This study investigated a stainless steel irradiated to a dose of over twenty displacement per atom at the temperature of a light water reactor operation in the fuel wrapper plates of a commercial pressurized water reactor by using three-dimensional atom probe. A high number density of Ni-Si precipitates was observed, which is one order of magnitude higher than that of Frank loops observed by transmission electron microscope. The morphology of the precipitate, such as size, number density and chemical composition, were analyzed in detail, then the hardening due to the precipitates was estimated by using Orowan-model. It is found that the Ni-Si precipitates have an important contribution to irradiation-hardening.

Report

(4 results)
  • 2013 Annual Research Report   Final Research Report ( PDF )
  • 2012 Research-status Report
  • 2011 Research-status Report
  • Research Products

    (25 results)

All 2014 2013 2012 2011 Other

All Journal Article (17 results) (of which Peer Reviewed: 8 results) Presentation (7 results) Remarks (1 results)

  • [Journal Article] Effects of post-irradiation annealing and re-irradiation on microstructure in surveillance test specimens of the Loviisa-1 reactor studied by atom probe tomography and positron annihilation2014

    • Author(s)
      Toyama, T., Kuramoto, A., Nagai, Y,. Inoue, K,. Nozawa, Y,. Shimizu, Y,. Matsukawa, Y,. Hasegawa, M,. Valo, M.
    • Journal Title

      Journal of Nuclear Materials

      Volume: in press

    • Related Report
      2013 Annual Research Report
  • [Journal Article] Intergranular Segregation in the Pressure Vessel Steel of a Commercial Nuclear Reactor Studied by Atom Probe Tomography2013

    • Author(s)
      T. Toyama, Y. Nagai, A. Al Mazouzi, M. Hatakeyama, M. Hasegawa, T. Ohkubo, E. Van Walle, R. Gerard
    • Journal Title

      Mater. Trans.

      Volume: 54 Pages: 2119-2124

    • NAID

      130004824987

    • Related Report
      2013 Final Research Report
  • [Journal Article] Microstructural changes in Russian-type reactor weld material after neutron irradiation, post-irradiation annealing and re-irradiation studied by atom probe tomography and positron annihilation spectroscopy2013

    • Author(s)
      A. Kuramoto, T. Toyama, Y. Nagai, K. Inoue, Y. Nozawa, M. Hasegawa, M. Valo
    • Journal Title

      Acta. Mater.

      Volume: 61 Pages: 5236-5246

    • Related Report
      2013 Final Research Report
  • [Journal Article] Positron annihilation study of neutron-irradiated nuclear reactor pressure vessel steels and their model alloy : Effect of purity on the post-ittadiation annealig behavior2013

    • Author(s)
      A. Kuramoto, Y. Nagai, T. Toyama, T. Takeuchi, M. Hasegawa
    • Journal Title

      Mater. Sci. Forum

      Volume: 733 Pages: 257-263

    • Related Report
      2013 Final Research Report
  • [Journal Article] Intergranular Segregation in the Pressure Vessel Steel of a Commercial Nuclear Reactor Studied by Atom Probe Tomography2013

    • Author(s)
      Toyama, T., Y. Nagai, A. Al Mazouzi, M. Hatakeyama, M. Hasegawa, T. Ohkubo, E. Van Walle and R. Gerard
    • Journal Title

      Materials Transactions

      Volume: 54 Pages: 2119-2124

    • NAID

      130004824987

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Microstructural changes in Russian-type reactor weld material after neutron irradiation, post-irradiation annealing and re-irradiation studied by atom probe tomography and positron annihilation spectroscopy2013

    • Author(s)
      Kuramoto, A., T. Toyama, Y. Nagai, K. Inoue, Y. Nozawa, M. Hasegawa and M. Valo
    • Journal Title

      Acta Materialia

      Volume: 61 Pages: 5236-5246

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Positron annihilation study of neutron-irradiated nuclear reactor pressure vessel steels and their model alloy: Effect of purity on the post-ittadiation annealig behavior2013

    • Author(s)
      Kuramoto, A., Y. Nagai, T. Toyama, T. Takeuchi and M. Hasegawa
    • Journal Title

      Materials Science Forum

      Volume: 733 Pages: 257-263

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Grain boundary segregation in neutron-irradiated 304 stainless steel studied by atom probe tomography2012

    • Author(s)
      T. Toyama, Y. Nozawa, W. Van Renterghem, Y. Matsukawa, M. Hatakeyama, Y. Nagai, A. Al Mazouzi, S. Van Dyck
    • Journal Title

      J. Nucl. Mater.

      Volume: 425 Pages: 71-75

    • Related Report
      2013 Final Research Report
  • [Journal Article] Microstructural changes of a thermally aged stainless steel submerged arc weld overlay cladding of nuclear reactor pressure vessels2012

    • Author(s)
      T. Takeuchi, J. Kameda, Y. Nagai, T. Toyama, Y. Matsukawa, Y. Nishiyama, K. Onizawa
    • Journal Title

      J. Nucl. Mater.

      Volume: 425 Pages: 60-64

    • Related Report
      2013 Final Research Report
  • [Journal Article] Post-irradiation annealing behavior of microstructure and hardening of a reactor pressure vessel steel studied by positron annihilation and atom probe tomography2012

    • Author(s)
      A. Kuramoto, T. Toyama, T. Takeuchi, Y. Nagai, M. Hasegawa, T. Yoshiie, Y. Nishiyama
    • Journal Title

      J. Nucl. Mater.

      Volume: 425 Pages: 65-70

    • Related Report
      2013 Final Research Report
  • [Journal Article] Grain Boundary Segregation in Neutron-irradiated 304 Stainless Steel Studied by Atom Probe Tomography2012

    • Author(s)
      T.Toyama, Y.Nozawa, W.Van Renterghem, Y.Matsukawa, M.Hatakeyama, Y.Nagai, A.Al Mazouzi & S.Van Dyck
    • Journal Title

      Journal of Nuclear Materials

      Volume: 425 Issue: 1-3 Pages: 71-75

    • DOI

      10.1016/j.jnucmat.2011.11.072

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Size estimation of embedded Cu nanoprecipitates in Fe by using affinitively trapped positrons2012

    • Author(s)
      Toyama, T. Tang, Z. Inoue, K. Chiba, T. Ohkubo, T. Hono, K. Nagai, Y. Hasegawa, M.
    • Journal Title

      Physical Review B

      Volume: 86 Pages: 104106-104106

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Microstructural Changes of a Thermally Aged Stainless Steel Submerged Arc Weld Overlay Cladding of Nuclear Reactor Pressure Vessels2012

    • Author(s)
      T.Takeuchi, J.Kameda, Y.Nagai, T.Toyama, Y.Matsukawa, Y.Nishiyama, K.Onizuka
    • Journal Title

      Journal of Nuclear Materials

      Volume: 425 Issue: 1-3 Pages: 60-64

    • DOI

      10.1016/j.jnucmat.2011.12.004

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Post-irradiation annealing behavior of microstructure and hardening of a reactor pressure vessel steel studied by positron annihilation and atom probe tomography2012

    • Author(s)
      A.Kuramoto, T.Toyama, T.Takeuchi, Y.Nagai, M.Hasegawa, T.Yoshiie, Y.Nishiyama
    • Journal Title

      Journal of nuclear material

      Volume: (未定)(In press) Issue: 1-3 Pages: 65-70

    • DOI

      10.1016/j.jnucmat.2011.10.019

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Irradiation-induced precipitates in a neutron irradiated 304 stainless steel studied by three-dimensional atom probe2011

    • Author(s)
      T. Toyama, Y. Nozawa, W. Van Renterghem, Y. Matsukawa, M. Hatakeyama, Y. Nagai, A. Al Mazouzi, S. Van Dyck
    • Journal Title

      J. Nucl. Mater.

      Volume: 418 Pages: 62-68

    • Related Report
      2013 Final Research Report
  • [Journal Article] Study on microstructural changes in thermally-aged stainless steel weld-overlay cladding of nuclear reactor pressure vessels by atom probe tomography2011

    • Author(s)
      T. Takeuchi, J. Kameda, Y. Nagai, T. Toyama, Y. Nishiyama, K. Onizawa
    • Journal Title

      J. Nucl. Mater.

      Volume: 415 Pages: 198-204

    • Related Report
      2013 Final Research Report
  • [Journal Article] Irradiation-induced precipitates in a neutron irradiated 304 stainless steel studied by three-dimensional atom probe2011

    • Author(s)
      T.Toyama, Y.Nozawa, W.Van Renterghem, Y.Matsukawa, M.Hatakeyama, Y.Nagai, A.Al Mazouzi, S.Van Dyck
    • Journal Title

      J.Nucl.Mater.

      Volume: 418 Issue: 1-3 Pages: 62-68

    • DOI

      10.1016/j.jnucmat.2011.07.027

    • Related Report
      2011 Research-status Report
    • Peer Reviewed
  • [Presentation] Effects of post-irradiation annealing and re-irradiation on microstructure in surveillance test specimens of a VVER-type RPV steel2013

    • Author(s)
      T. Toyama, A. Kuramoto, Y. Nozawa, Y. Matsukawa, M. Hasegawa, Y. Nagai
    • Organizer
      IGRDM-17
    • Place of Presentation
      Les Embiez, French Riviera, France
    • Related Report
      2013 Annual Research Report
  • [Presentation] ベルギーBR2炉を用いた多段・多分割引き上げ照射計画2013

    • Author(s)
      外山 健、鳴井 実、山崎 正徳、鈴木 克弥、四竃 樹男
    • Organizer
      日本金属学会
    • Place of Presentation
      金沢大学
    • Related Report
      2013 Annual Research Report
  • [Presentation] Effects of post-irradiation annealing and re-irradiation on microstructure in surveillance test specimens of RPV steel studied by 3D-AP and positron annihilation2013

    • Author(s)
      T. Toyama, A. Kuramoto, Y. Nozawa, Y. Matsukawa, M. Hasegawa, Y. Nagai, M. Valo
    • Organizer
      TMS-2013
    • Place of Presentation
      San Antonio, USA
    • Related Report
      2012 Research-status Report
  • [Presentation] 旧ソ連型炉圧力容器鋼監視試験片のミクロ組織分析:照射後焼鈍および再照射効果2012

    • Author(s)
      外山健、蔵本明、井上耕治、野沢康子、長谷川雅幸、永井康介、M.Valo
    • Organizer
      京都大学原子炉実験所専門研究会
    • Place of Presentation
      大阪府熊取町
    • Related Report
      2012 Research-status Report
  • [Presentation] 旧ソ連型炉圧力容器鋼監視試験片のミクロ組織分析: 照射後焼鈍および再照射効果2012

    • Author(s)
      外山健、蔵本明、井上耕治、野沢康子、長谷川雅幸、永井康介、M.Valo
    • Organizer
      東北大学金属材料研究所ワークショップ
    • Place of Presentation
      宮城県仙台市
    • Related Report
      2012 Research-status Report
  • [Presentation] Irradiation-induced precipitates and grain boundary segregation in 304 stainless steel neutron-irradiated to 24 dpa studied by atom probe tomography2011

    • Author(s)
      T. Toyama, Y. Nozawa, Y. Matsukawa, M. Hatakeyama, Y. Nagai, W. Van Renterghem, A. Al Mazouzi, S. Van Dyck
    • Organizer
      IGRDM-16
    • Place of Presentation
      アメリカ・Santa Barbara
    • Year and Date
      2011-12-09
    • Related Report
      2013 Final Research Report
  • [Presentation] Irradiation-induced precipitates and grain boundary segregation in 304 stainless steel neutron-irradiated to 24 dpa studied by atom probe tomography2011

    • Author(s)
      T. Toyama et al.
    • Organizer
      IGRDM-16
    • Place of Presentation
      Santa Barbara, 米国
    • Related Report
      2011 Research-status Report
  • [Remarks]

    • URL

      http://www.imr-oarai.jp/index.html

    • Related Report
      2013 Final Research Report

URL: 

Published: 2011-08-05   Modified: 2019-07-29  

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