厚鋼板の疲労き裂進展特性に及ぼす第二相マルテンサイトの影響 Effects of martensite as a hard secondary phase on fatigue crack growth properties in heavy steel plate

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The authors reported that the steel with an elongated and banded martensitic structure in a ferrite matrix has significantly high resistance to fatigue crack growth in the thickness direction. In this paper, the effects of area fraction, hardness, and aspect ratio of martensite with similar martensitic morphology and distribution on fatigue crack growth properties are investigated. As a result, the fatigue crack growth rate decreases with increasing hardness, area fraction, and aspect ratio of martensite. This corresponds to enhancement of crack deflection and branching. This crack path can be attributed to two mechanisms concerned with the increase of resistance and the decrease of driving force of crack growth. First, martensite constrains plastic deformation of ferrite at the crack tip. Second, transformation expansion of martensite changes the internal stress in the microstructure. The reasonability of these two mechanisms is confirmed experimentally.

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  • 溶接学会論文集 : quarterly journal of the Japan Welding Society

    溶接学会論文集 : quarterly journal of the Japan Welding Society 27(1), 21-27, 2010-01-20

    JAPAN WELDING SOCIETY

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各種コード

  • NII論文ID(NAID)
    10030148497
  • NII書誌ID(NCID)
    AN1005067X
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    02884771
  • データ提供元
    CJP書誌  J-STAGE 
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