Effects of martensite as a hard secondary phase on fatigue crack growth properties in heavy steel plate

DOI 8 Citations 29 References

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Other Title
  • 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

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Abstract

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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Details 詳細情報について

  • CRID
    1390282679701346048
  • NII Article ID
    10030148497
  • NII Book ID
    AN1005067X
  • DOI
    10.2207/qjjws.27.21
  • ISSN
    24348252
    02884771
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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