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A Research on the Mechanisms of Radiation Embrittlement of Steels

Research Project

Project/Area Number 02452289
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Nuclear engineering
Research InstitutionUniversity of Tokyo

Principal Investigator

ISHINO Shiori  University of Tokyo, Faculty of Engineering, Professor, 工学部, 教授 (70010733)

Co-Investigator(Kenkyū-buntansha) KAWANISHI Hiroshi  University of Tokyo, Faculty of Engineering Research Associate, 工学部, 助手 (40010970)
SEKIMURA Naoto  University of Tokyo, Faculty of Engineering Associate Professor, 工学部, 助教授 (10183055)
IWATA Shuichi  University of Tokyo, Research into Artifacts, Center for Engineering, Professor, 人工物工学研究センター, 教授 (50124665)
Project Period (FY) 1990 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 1992: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1991: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1990: ¥3,600,000 (Direct Cost: ¥3,600,000)
Keywordsradiation embrittlement of pressure vessel steels / iron-based model alloys / ion irradiation / positron annihilation / S-parameter / copper effect / copper-vacancy complexes / neutron irradiation / 空孔-銅複合体 / 微小硬さ試験 / 透過型電子顕微鏡観察 / 陽電子消滅法 / 欠陥クラスタ- / 圧力容器鋼 / 純鉄 / 鉄合金 / 照射脆化 / 添加元素効果 / 照射硬化 / 照射組織変化
Research Abstract

Iron based model alloys of which copper and nickel contents are varied have been employed as the specimen. These model alloys were irradiated with 3-4MeV nickel ions from a tandetron and with protons from 3.75MeV van de Graaff at the High Fluence Irradiation Facility of the University of Tokyo (HIT). In parallel with these, neutron irradiations are being carried out using the Japanese Material Testing Reactor (JMTR).
Positron annihilation study in collaboration with Professor Tanigawa's Lab., Institute of Material Science, Tsukuba University was one of the main interests in this fiscal year. The model alloys were irradiated with nickel ions accelerated to 3MeV at 563K.The irradiation dose was 1mdpa at the damage peak depth as calculated by the EDEP-1 code. Monoenergetic positron beams with energies between 0 and 30keV were impinged into the ion-irradiated surface of the sample, and the energy spectrum of the annihilation gamma-rays were detected with a semiconductor detector.These measu … More rements were repeated with various positron accelerating voltages. Each irradiated sample showed the increase of S-parameter in comparison with the unirradiated sample. This may indicate the production of vacancy-type defects. With regard to the effect of the material composition, copper-bearing alloys showed the greater increase of the S-parameter than the alloys containing no copper. Nickel had no effect on the S-parameter increase. It is speculated from the results that there is a strong interaction between copper and vacancies in iron, and that the production of the copper-vacancy complexes occurs. These results were reported at the autumn meeting of the Japan Institute of Metals in October, 1992. Although similar measurements of the 3MeV-proton irradiated samples were attempted, increase of S-parameter was not detected due to the low defect concentration. It seems necessary to increase the irradiation dose or to lower the proton energy for detecting the S-parameter increase caused by proton irradiation.
With regard to the neutron irradiation at the JMTR,two series of irradiations have already started. One series is the irradiation under varied neutron spectrum, another is the irradiation under two neutron flux levels which differ by one order of magnitude. Post irradiation experiments will begin from next year. The results of the ion irradiation would give the profitable fundamental information for the analyzes of the neutron irradiation data. Less

Report

(4 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • 1990 Annual Research Report
  • Research Products

    (37 results)

All Other

All Publications (37 results)

  • [Publications] 森下和功、関村直人、岩田修一、石野 栞: "分子効力学的手法によるカスケード損傷過程の解明" シミュレーション. 10. 352-360 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S.Ishino.N.Sekimura: "Primary Knock-on Atom Energy Dependence of Radiation Damage" Annales de Chemie Fr.16. 341-350 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.Sekimura,S.Ishino: "In-situ Observation of Cascade Damage under Heavy Ion Irradiation" Rad. Effects and Defects in Solids. 124. 109-116 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S.Ishino,N.Sekimura,H.Sakaida,Y.Kanzaki: "In-situ Observation of Heavy Ion Radiation Damage Some FCC Metals" Mater.Sci.Forum. 97-99. 165-182 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K.Morishita, T.Toyonaga, N.Sekimura, S.Ishino: "Temperature Effect on the Primary State of Displacement Cascade" Trans.Mater.Res.Soc.Japan. 110-117 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K.Morishita, N.Sekimura,S.Ishino: "A Molecular Dynamics Study on the Collisional and Cooling Phases of Cascade Damage" Red.Effects and Defects in Solids. ((in press))

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K.Morishita, N.Sekimura, T.Toyonaga,S.Ishino: "Thermodynamical Evaluation of Cascade Damage Evolution by Molecular Dynamics Caluculation" J.Nucl.Mater.191-194. 1123-1127 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Kanzaki,N.Sekimura, S.Ishino: "Accumulation Processes of Cascade Damage under Heavy Ion Irradiation" J.Nucl.Mater.191-194. 1119-1122 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Iwai,H.Kawanishi,Y.Arai,M.Kato,N.Sekimura,S.Ishino: "Hardening Characteristics of Ion Irradiated Iron Based Model Alloys" ASTM-STP. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S.Ishino: "Irradiation Environment and Materials Behavior-Fundamentals of Innovative Materials Technology" Pro.4th Int.Symp.on Adv.Nucl.Energy Research. 456-466 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S.Ishino: "Time and Temperature Dependence of Cascade Induced Defects Production in In-situ Experiments and Computer Simulation" J.Nucl.Mater.(to be published).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K.Morishita, N.Sekimura, S.Iwata and S.Ishino: ""A Molecular Dynamics Study on Cascade Damage Processes" in Japanese." Simulation. 10. 352-360 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S.Ishino and N.Sekimura: "Primary Knock-on atom Energy Dependence of Radiation Damage" Annales de Chemie, Science des Materiaux. 16. 341-350 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.Sekimura and S.Ishino: "In-situ Observation of Cascade Damage under Heavy Ion Irradiation" Radiation Effects and Defects in Solids. 124. 109-116 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S.Ishino, N.Sekimura, H.Sakaida and Y.Kanzaki: "In-situ Observation of Heavy Ion Radiation Damage in Some FCC Metals" Mater.Sci.Forum. 97-99. 165-182 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K.Morishita, Y.Toyonaga, N.Sekimura and S.Ishino: "Temperature Effect on the Primary State of Displacement Cascade" Trans.Mater.Res.Soc.Japan. 110-117 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K.Morishita, N.Sekimura and S.Ishino: "A Molecular Dynamics Study on the Collisional and Cooling Phases of Cascade Damage" Radiation Effects and Defects in Solids. (in press.).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K.Morishita, N.Sekimura and S.Ishino: "Thermokynamical Evaluation of Cascade Damage Evolution by Molecular Dynamics Calculation" J.Nucl.Mater. (ICFRM-5). 191-194. 1123-1127 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Kanzaki, N.Sekimura and S.Ishino: "Accumulation Processes of Cascade Damage under Heavy Ion Irradiation" J.Nucl.Mater. (ICFRM-5). 191-194. 1119-1122 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Iwai, H.Kawanishi, Y.Arai, M.Kato, N.Sekimura and S.Ishino: "Hardening Characteristics of Ion Irradiated Iron Based Model Alloys" ASTM-STP. (in press.).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S.Ishino: "Irradiation Environment and Materials Behavior - Fundamentals of Innovative Materials Technology" Pro.4th Int.Symp.on Adv.Nucl.Energy Research. 456-466 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S.Ishino: "Time and Temperature Dependence of Cascade Induced Defect Production in In-situ Experimentals and Computer Simulation" J.Nucl.Materials. (to be published.).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 森下 和功、関村 直人、岩田 修一、石野 栞: "分子効力学的手法によるカスケード損傷過程の解明" シミュレーション. 10. 352-360 (1991)

    • Related Report
      1992 Annual Research Report
  • [Publications] S.Ishino,N.Sekimura: "Primary Knock-on Atom Energy Dependence of Radiation Damage" Annales de Chemie Fr.16. 341-350 (1991)

    • Related Report
      1992 Annual Research Report
  • [Publications] N.Sekimura,S.Ishino: "In-situ Observation of Cascade Damage under Heavy Ion Irradiation" Red.Effects and Defects in Solids. 124. 109-116 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] S.Ishino,N.Sekimura,H.Sakaida,Y.Kanzaki: "In-situ Observation of Heavy Ion Radiation Damage Some FCC Metals" Mater.Sci.Forum. 97-99. 165-182 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] K.Morishita,T.Toyonaga,N.Sekimura,S.Ishino: "Temperature Effect on the Primary State of Displacement Cascade" Trans.Mater.Res.Soc.Japan. 110-117 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] K.Morishita,N.Sekimura,S.Ishino: "A Molecular Dynamics Study on the Collisional and Cooling Phases of Cascade Damage" Rad.Effects and Defects in Solids.

    • Related Report
      1992 Annual Research Report
  • [Publications] K.Morishita,N.Sekimura,T.Toyonaga,S.Ishino: "Thermodynamical Evaluation of Cascade Damage Evolution by Molecular Dynamics Caluculation" J.Nucl.Mater. 191-194. 1123-1127 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Y.Kanzaki,N.Sekimura,S.Ishino: "Accumulation Processes of Cascade Damage under Heavy Ion Irradiation" J.Nucl.Mater.191-194. 1119-1122 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Iwai,H.Kawanishi,Y.Arai,M.Kato,N.Sekimura,S.Ishino: "Hardening Characteristics of Ion Irradiated Iron Based Model Alloys" ASTM-STP.

    • Related Report
      1992 Annual Research Report
  • [Publications] S.Ishino: "Irradiation Environment and Materials Behavior-Fundamentals of Innovative Materials Technology" Pro.4th Int.Symp.on Adv.Nucl.Energy Research. 456-466 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] S.Ishino: "Time and Temperature Dependence of Cascade Induced Defects Production in In-situ Experiments and Computer Simulation" J.Nucl.Mater.

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Iwai,H.Kawanishi,Y.Arai,Y.Kato,N.Sekimura and S.Ishino: "Hardening Characteristics of Ion Irradiated Iron Based Model Alloys" Small Specimen Test Techniques and Their Application to Nuclear Reactor Vessel Themal Annealing and Plant Life Extension. (1992 1993)

    • Related Report
      1991 Annual Research Report
  • [Publications] K.Morishita,N.Sekimura and S.Ishino: "Thermodynamical Evaluation of Cascade Damage by Molecular Dynamics Calculation" Journal of Nuclear Materials. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 石野 栞: "金属の照射損傷(核燃料・夏期セミナ-テキスト第四章)" 日本原子力学会核燃料研究連絡会, 4-1-4-21 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 石野 栞: "The Effect of Composition on Irradiation Embrittlement" Nuclear Engineering and Design. 119. 139-148 (1990)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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