Fatigue crack growth behavior of alloy 800h at elevated temperature

K. Y. Hour, J. F. Stubbins

Research output: Contribution to journalArticlepeer-review

Abstract

High temperature crack growth behavior is investigated over a wide range of Rratios, frequencies, and temperatures in Alloy 800H. It is found that high R-ratio, low frequency, or high temperature can enhance creep damage and thus induce an intergranular crack growth mode. At low frequencies, the nonlinear fracture mechanics parameter, C*, is found to correlate time-dependent fatigue crack growth rate well if the applied mean stress is used in calculating C*. On the other hand, the Paris crack growth law using Keff is proven to be an adequate expression to use when fatigue (time-independent) damage dominates. These conclusions correlate well with damage mechanisms observed from sample fracture surfaces.

Original languageEnglish (US)
Pages (from-to)271-279
Number of pages9
JournalJournal of Engineering Materials and Technology, Transactions of the ASME
Volume113
Issue number3
DOIs
StatePublished - Jul 1991

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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