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1997 Fiscal Year Final Research Report Summary

IDENIIFICATION OF RADIATION EMBRITIEMENT CENIERS IN PRESSURE VESSEL STEELS

Research Project

Project/Area Number 07458107
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field エネルギー学一般・原子力学
Research InstitutionTOKAI UNIVERSITY

Principal Investigator

ISHINO Shiori  TOKAI UNIVERSITY,DEPARTMENT OF NUCLEAR ENGINEERING,PROF., 工学部, 教授 (70010733)

Co-Investigator(Kenkyū-buntansha) SEKIMURA Naoto  UNIV.OF TOKYO,DEPT.OF QUANTUM ENGINEERING AND SYSTEMS SCIENCE, ASSOC.PROF, 大学院・工学系研究科, 助教授 (10183055)
Project Period (FY) 1995 – 1997
KeywordsPressure vessel steels / Irradiation embrittlement / Irradiation correlation / Copper cluster / Electrical resistivity / Defect interactions / Post-irradiation annealing / Automatic measurement
Research Abstract

Electical resistivity and micro-hardness measurements have been applied to elucidate the embrittlement mechanisms of pressure vessel steels. Fe-Cu model alloys were irradiated with energetic protons and from annealing experiments, models of production, growth and annihilation of various defects were discussed. Irradiation correlation to estimate radiation effects has also been studied. The results are summarized as follows :
1.Studies with electrical resistivity measurements
Automatic measurement system of electrical resistivity with high precision has been established. It has been found that the resistivity decreases after proton irradiation in Fe-Cu alloys due to association of copper or other impurities with radiation induced defects. Re-analysis of preliminary annealing experiments suggests the presence of clustering process of defect, copper and carbon atoms, defect annihilation processes with liberation of these impurities and so on. A model of post irradiation processes has been p … More resented. To further confirm the model, it will be necessary to obtain activation energies and frequency factors for these stages and the dependence of the stages on impurity concentrations.
2.Studies of ageing processes of Fe-Cu alloys by means of micro-hardness measurements.
To elucidate the behavior of copper atoms in Fe-Cu, age-hardening experiments have been performed. The alloys show typical age-hardening. The maximum hardness depends on copper concentration, indicating that the hardening is explained by supersaturation of copper concentration at the ageing temperatures. It is important to note that copper in solution, not the total concentration should be considered in discussing the effect of copper in radiation embrittlement.
Apparent activation energy obtained from time to reach maximum hardness is 154kJ/mol, which is much less than the activation energy of diffusion of copper in iron. This seems to indicate the presence of quenched-in vacancies or association of copper with vacancy
3.Irradiation correlation
Irradiation correlation is a mechamism-based methodology to estimate radiation effects. As a part of irradiation correlation, defect clustering mechanisms, application of in-situ observation of radiation damage with energetic heavy ions, hierarchical structure of irradiation correlation and modeling have been studied. Less

  • Research Products

    (29 results)

All Other

All Publications (29 results)

  • [Publications] K.Morishita: "The Correlation of Defect Distribution in Collisional Phase with Measured Cascade Collapse Probability" Nucl.Instr.and Methods in Phys.Res.B102. 67-71 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.A.Koptelov: "Interstitial cluster formation in metals under intense irradiation" Journal of Nuclear Materials. 225. 38-52 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.A.Koptelov: "On density effects in point defect solutions under irradiation. I.Qualitative consideration of quasi-equilibrium states." Journal of Nuclear Materials. 232. 87-97 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.A.Koptelov: "On density effects in point defect solutions under irradiation. II.FOrmation of interstitial dislocation loops." Journal of Nuclear Materials. 232. 98-112 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Ishino: "History.progress.achievement and future prospect of research activities on fusion materials by Japanese university researchers." Journal of Nuclear Materials. 233-237. 1535-1540 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Ishino: "Implications of fundamental radiation damage studies in the research and development of materials for a fusion reactor" Journal of Nuclear Materials. 239. 24-33 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Ishino: "A Review of in-situ Observation of Defect Production with Energetic Heavy Ions" Journal of Nuclear Materials. 251. 225-236 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Almazouzi: "Defect Production,Accumulation,and Materials Performance in an Irradiation Environment" Journal of Nuclear Materials. 251. 291-294 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Taketoshi Arai: "Status of Preliminary Tests on Innovative Basic Researches for HTTR Irradiation Program" Proceedings of the NEA Workshop on High Temperature Engineering Research Facilities and Experiments. 1-12 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Ishino: "Role of Fundamental Defect Processes in Irradiation Correlation in Structural Materials for Nuclear Energy Systems" Radiation Effects and Defects in Solids. (in press). (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤本 文範 編: "イオンビーム工学 イオン・固体相互作用編" 内田老鶴圃, 363 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 池上 英雄 編: "核融合研究 II、核融合炉工学" 名古屋大学出版会, 981 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大矢 晴彦(監修): "高純度化技術大系、第3巻 高純度物質製造プロセス" フジ・テクノシステム, 1190 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 依田 連平 編: "余寿命予測と材料" 裳華房 (印刷中),

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Morishita: "The correlation of defect distribution in collisional Phase with Measured Cascade Collapse Probability" Nucl.Instr.& Methods in Phys.Res.B102. 67-71 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E.A.Koptelov: "Interstitial Cluster Formation in Metals under Intense Irradiation" Journal of Nuclear Materials. 225. 38-52 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E.A.Koptelov: "On Density Effects in Point Defect Solutions under Irradiation I.Qualitative Consideration of Quasiequilibrium States" Journal of Nuclear Materials. 232. 87-97 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E.A.Koptelov: "On Density Effects in Point Defect Solutions under Irradiation II.Formation of Interstitial dislocation loops." Journal of Nuclear Materials. 232. 98-112 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Ishino: "History, Progress, Achievement and Future Prospect of Research Activities on Fusion Materials by Japanese University Researchers" Journal of Nuclear Materials. 233-237. 1535-1540 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Ishino: "Implication of Fundamental Radiation Damage Studies in the Research and Development of Materials for a Fusion Reactor" Journal of Nuclear Materials. 239. 24-33 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Ishino: "A Review of In-situ Observation of Defect Production with Energetic Heavy Ions" Journal of Nuclear Materials. 251. 225-236 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Almazouzi: "Defect Production, Accumulation, and Materials Performance in an Irradiation Environment" Journal of Nuclear Materials. 251. 291-294 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Arai: "Status of Preliminary Tests on Innovative Basic Researches for HTTR Irradiation Program" Proc.NEA Workshop on High Temperature Engineering Research Facilities and Experiments. 1-12 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Ishino: "Role of Fundamental Defect Processes in Irradiation Correlation in Structural Materials for Nuclear Energy Systems" Radiation Effects and Defects in Solids. (to be published). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Ishino: "Problems of Researches on Radiation Embrittlement of Light Water Reactor Pressure Vessel Steels" Summary of Presentations at the Spring Meeting of Atomic Energy Society of Japan, March, 1996. 475-476 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] F.Fujimoto (Editor): Ion Beam Engineering, Ion-Solid Interactions. Uchida-Rookakuho, 363 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Ikegami (Editor): Nuclear Fusion Research II.Fusion Reactor Technology. Nagoya University Press, 981 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Ooya (Editor): Handbook of High-Purification Technology, Vol.3, Manufacturing Processes of Highly Purified Products. Fuji Technosystem, 1190 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R.Yoda (Editor): Lifetime Evaluation and Materials. Shokabou (to be published),

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

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Published: 1999-03-16  

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