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Prototype design of an SEM capable of detecting helium desorption during high temperature tensile test

Research Project

Project/Area Number 05555164
Research Category

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

Allocation TypeSingle-year Grants
Research Field Physical properties of metals
Research InstitutionTohoku University

Principal Investigator

KIMURA Akihiko  Tohoku University Institute for Materials Research, Associate Professor, 金属材料研究所, 助教授 (90195355)

Co-Investigator(Kenkyū-buntansha) SHIBATOMI Kunio  JEOL Ltd.Electron optics technology, Director, 電子工学技術本部, センター長
YANO Shinzo  Tohoku University Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (60005915)
MINONISHI Yasuhide  Tohoku University Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (70005958)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥14,500,000 (Direct Cost: ¥14,500,000)
Fiscal Year 1994: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1993: ¥11,700,000 (Direct Cost: ¥11,700,000)
KeywordsFusion reactor materials / helium effects / Scanning electron microscope / vanadium alloys / helium embrittlement / high temperature strength / tritium trick / 走査電子顕微鏡 / 電顕内高温引張 / ガス分析 / 水素脆化 / 金属間化合物 / その場観察 / 照射効果 / 高温変形
Research Abstract

A large amount of helium is generated in fusion reactor materials by 14MeV neutron irradiation leading to so called high temperature helium embrittlement. The mechanism of helium embrittlement is believed to be due to the accumulation of helium to grain boundaries where grain boundary cohesion is severely impaired. The details of the mechanism, however, are still not known yet. In the present project, a commercially available scanning electron microscope (SEM) is customized in such a way that helium desorbed from deforming specimen at high temperature can be detected along with in situ observation. Thereby the relation between helium desorption and slip band formation and crack opening is examined in order to investigate the mechanism of helium embrittlement.
Main functions of this apparatus are : (1) magnified observation of specimen surface, (2) in situ tensile test capability, (3) specimen heating, (4) helium desorption detection, etc. A lead screw type tensile mechanism has been ado … More pted driven by a stepping motor. Specimen heating was done by direct electrical heating. This method lacks in uniformity in temperature while temperature response is superior and the volume of the heated zone can be minimized. Temperature measurement is done using a thermocouple attached to the specimen grip. Actual temperature of the specimen is obtained by calibrating using a dummy specimen on which thermocouple is attached in the central part of the gage portion. A quadrupole mass spectrometer is used to measure the helium desorption.
Several iteration cycles were necessary to optimize the shielding of thermal electrons without obstructing the view area. The apparatus with intended functions has been successfully constructed. Vanadium alloy specimens doped with tritium trick have been tensile-tested in situ in this apparatus. Stress-strain curves and helium desorption curves were recorded simultaneously with video-images of SEM images on a VTR.Some of the important findings from these experiments are that helium desorption occurred in synchronous with crack opening at the specimen surface. Less

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] M.Tanaka: "Effects of implanted helium on the mechanical properties of vanadiumbased binary alloys" Mater.Trans.JIM.34. 1083-1089 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Matsui: "Mechanical properties of vanadium alloys doped with helium using various techniques" ASTM STP. 1175. 1215-1227 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Matsui: "Effects of temperature history during neutron irradiation on the microstructure of vanadium alloys." J.Nucl.Mater.212-215. 784-789 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] K.Kuji: "Microstructure of vanadium alloys after irradiation at 700 C" SCI.REP.RITU.A-. A-40. 121-124 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Matsui: "R&D of Vanadium Alloys for Fusion in Japan" “Materials of Advanced Energy Systems. 271-276 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] D.L.Smith: "Development of vanadium-base alloys for fusion first-wall-blanket applications." Fusion Eng.Des.29. 399-410 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Matsui: "Development of triple fission technique for simulating fusion neutron irradiation" J.Nucl.Mater.1561. 233-237 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Matsui: "Progress in Radiation Effect Studies of Low Activation Vanadium Alloys" Proc.Sixteenth IAEA Fusion Energy Conference. 3. 509-515 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] A.Kimura: "Irradiation hardening of reduced activation martensitic steels" J.Nucl.Mater.270. 233-237 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Tanaka: "Effects of implanted helium on the mechanical properties of vanadium-based binary alloys" Mater.Trans.JIM.34. 1083-1089 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Matsui: "Mechanical properties of vanadium alloys doped with helium using various techniques" ASTM STP. 1175. 1215-1227 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Matsui: "Effects of temperature history during neutron irradiation on the microstructure of vanadium alloys" J.Nucl.Mater. 212-215. 784-789 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] K.Kuji: "Microstructure of vanadium alloys after irradiation at 700 C" SCI.REP.RITU.A-40. 121-124 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Matsui: "R & D of Vanadium Alloys for Fusion in Japan" "Materials for Advanced Energy Systems and Fission and Fusion Engineering" (2)., Eds.A.Kohyama, et al.271-276 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] D.L.Smith: "Development of vanadium-base alloys for fusion first-wall-blanket applications" Fusion Eng.Des.29. 399-410 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Matsui: "Development of triple fission technique for simulating fusion neutron irradiation" J.Nucl.Mater.1561. 233-237 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Matsui: "Progress in Radiation Effect Studies of Low Activation Vanadium Alloys" Proc.Sixteenth IAEA Fusion Energy Conference, Montreal, Canada. 507-515 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] A.Kimura: "Irradiation hardening of reduced activation martensitic steels" J.Nucl.Mater.270. 233-237 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] A.Kimura: "Impact properties of intenetallic compounds" Materials Science and Engimeering. A176. 425-430 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] A.Kimura: "High susceptibility to hydrogen embrittlement of Co3Ti intermetallic compounds" Proc.10th Int.Conf.of Strength of Materials. 937-940 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] A.Kimura: "Critical pressures of water vapor and hydrogen gas causing intergranular brittle fracture of Co3Ti at room temperature" Materians Trane.JIM. 35. 879-887 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] A.Kimura: "Modeling hydrogen transport by dislocations in intermetallic compounds" INTERMETALLICS. (発表予定).

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Kuji: "Microstructure of vanadium alloys after irradiation at 700C" Sci.Rep.RITU. A40. 121-124 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] H.Matsui: "Effects of temperature history during neutron irradiation on the microstructure of vanadium alloys" J.Nucl.Mater.,. 211-215. 784-789 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Akihiko Kimura: "High Temperature Impact Properties of Intermetallic Compounds" Proc.of 3rd Japan International SAMPE Symposium. vol.2. 1433-1437 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Akihiko Kimura: "Impact Properties of Intermetallic Compounds" Materials Science and Engineering. (in press). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] A.Kimura: "Microtructural evolution of low activation ferritic alloys under neutron irradiation." J.Nucl.Mater.(in press). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] A.Kimura: "Designation of alloy composition of low activation martensitic steel." J.Nucl.Mater.(in press). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] A.Kimura: "Tensile properties of reduced activation Fe-9Cr-2W steels after FFTF irradiation." J.Nucl.Mater.(in press). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] T.Muroga: "The influence of helium production on swelling suppression by phosphorus and titanium in Fe-Cr-Nn." J.Nucl.Mater.(in press). (1994)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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