Transition mechanism of cycle- to time-dependent acceleration of fatigue crack-growth in 0.4%C Cr-Mo steel in a pressurized gaseous hydrogen environment

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説明

Fatigue crack-growth (FCG) tests were conducted in 90-MPa-hydrogen gas on three martensitic steels with tensile strengths of 811, 921 and 1025 MPa. Increased strength levels resulted in augmented, hydrogen-induced FCG acceleration. In the highest-strength material, the FCG rate per cycle was dependent on test frequency, i.e., the crack-growth distance was proportional to load duration. Several observations and analyses revealed that such time-dependent FCG was due to stress-driven cracking along hierarchical martensite boundaries, stemming from the hydrogen-induced degradation of their cohesive strengths as a result of competition between mechanically-determined crack-tip stress (driving stress) and statistically-distributed boundary strength (resistance stress).

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詳細情報 詳細情報について

  • CRID
    1050018428980270464
  • NII書誌ID
    AA00234062
  • HANDLE
    2324/7161789
  • ISSN
    01421123
  • 本文言語コード
    en
  • 資料種別
    journal article
  • データソース種別
    • IRDB

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