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2013 Fiscal Year Final Research Report

Clarification of crack initiation mechanism under irradiation and fatigue and development of method for detecting and lengthening initiation life by nano-level analysis of surface morphology

Research Project

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Project/Area Number 23760803
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Nuclear fusion studies
Research InstitutionTohoku University

Principal Investigator

NOGAMI Shuhei  東北大学, 工学(系)研究科(研究院), 准教授 (00431528)

Project Period (FY) 2011 – 2013
Keywords低放射化フェライト鋼 / 溶接部 / 疲労 / 照射損傷 / 微小き裂発生 / 表面構造
Research Abstract

The objective of this study is to clarify the crack initiation mechanism under irradiation and fatigue damages in the reduced activation ferritic steel and its weld, and to develop the index for detecting the crack initiation and the method for lengthening the initiation life.It was clarified that the crack initiation occurred at the prior austenitic grain boundary, the packet boundary, the block boundary, and the inside of the block structure. Most of the crack initiation was observed in the matrix. The irradiation damage induced the shortening of the initiation life. No change of the initiation sites and their ratio occurred due to the irradiation damage.The suppression of the crack growth by the prior austenitic grain boundary was clarified regardless of the irradiation damage. Based on this result, the fatigue crack initiation under the irradiation damage would be suppressed by the optimization of the grain size and the probability of the existence of the grain boundary.

  • Research Products

    (9 results)

All 2013 2012 2011

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

  • [Journal Article] Effect of Helium on Fatigue Crack Growth and Life of Reduced Activation Ferritic/Martensitic Steel2013

    • Author(s)
      S. Nogami, M. Takahashi, A. Hasegawa, M. Yamazaki
    • Journal Title

      Journal of Nuclear Materials

      Volume: 442巻 Pages: S43–S47

    • DOI

      10.1016/j.jnucmat.2013.02.031

    • Peer Reviewed
  • [Presentation] 微小き裂成長挙動に基づく低放射化フェライト鋼の疲労寿命予測手法の開発2013

    • Author(s)
      野上修平、長谷川晃、山崎正徳
    • Organizer
      プラズマ・核融合学会第30回年会
    • Place of Presentation
      東京
    • Year and Date
      2013-12-06
  • [Presentation] 低放射化フェライト鋼溶接継手における疲労破損挙動の解析2013

    • Author(s)
      野上修平、宇佐美博士、福田誠、藪内聖皓、長谷川晃、谷川博康
    • Organizer
      日本原子力学会2013年秋の大会
    • Place of Presentation
      八戸
    • Year and Date
      2013-09-05
  • [Presentation] 低放射化フェライト鋼の疲労き裂発生挙動に及ぼす照射損傷の影響2012

    • Author(s)
      山本雄也、中井亮介、野上修平、藪内聖皓、長谷川晃
    • Organizer
      プラズマ・核融合学会第29回年会
    • Place of Presentation
      春日
    • Year and Date
      2012-11-27
  • [Presentation] 低放射化フェライト鋼の疲労き裂成長挙動に及ぼすヘリウムの影響2012

    • Author(s)
      中井亮介、野上修平、藪内聖皓、長谷川晃、安堂正己、谷川博康
    • Organizer
      プラズマ・核融合学会第29回年会
    • Place of Presentation
      春日
    • Year and Date
      2012-11-27
  • [Presentation] Fatigue properties of helium-implanted F82H steel2012

    • Author(s)
      S. Nogami, R. Nakai, K. Yabuuchi, A. Hasegawa, H. Tanigawa, M. Ando
    • Organizer
      NuMat 2012 The Nuclear Materials Conference
    • Place of Presentation
      大阪
    • Year and Date
      2012-10-23
  • [Presentation] 低放射化フェライト鋼の疲労特性に及ぼすヘリウムの影響2012

    • Author(s)
      中井亮介、野上修平、長谷川晃、谷川博康、濱口大
    • Organizer
      第9回核融合エネルギー連合講演会
    • Place of Presentation
      神戸
    • Year and Date
      2012-06-28
  • [Presentation] プロトン照射したステンレス鋼における繰返し応力負荷による微小き裂発生2012

    • Author(s)
      山本雄也、佐藤佑毅、野上修平、長谷川晃
    • Organizer
      日本原子力学会2012年春の年会
    • Place of Presentation
      福井
    • Year and Date
      2012-03-20
  • [Presentation] Effect of Irradiation on Micro-Crack Initiation in Fatigued Austenitic Stainless Steel2011

    • Author(s)
      S. Nogami, Y. Sato, A. Hasegawa
    • Organizer
      ICFRM-15
    • Place of Presentation
      チャールストン,アメリカ合衆国
    • Year and Date
      2011-10-20

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Published: 2015-06-25  

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