Growth of Small Fatigue Cracks in Incoloy-908

  • Z. Mei
  • C. Krenn
  • J. W. MorrisJr.
Part of the An International Cryogenic Materials Conference Publication book series (ACRE, volume 40)


Fatigue crack growth rates at 298 and 77 K were determined from conventional long-crack growth test at constant R, closure-free long-crack growth test at constant Kmax, and direct observation of small surface cracks. It was observed that the growth of small surface cracks was influenced by grain boundaries and orientations, resulting in tortuous paths and discontinuous growth. Although some surface cracks grew slow or even became dormant while some grew rapidly, the average growth rate of many small surface cracks was close to the growth rate of a long crack. When crack length < 100 μm, the threshold cyclic stress intensity Kth for a small surface crack to grow was lower than those for either a long crack or a closure-free long crack to grow, while the threshold cyclic stress σth was relatively constant and close to the fatigue endurance limit. Therefore, the combination of the fatigue endurance limit of polished surface and the threshold cyclic stress intensity of long crack can be used to determined the safety criterion at 4.2 K against fatigue failure.


Fatigue Crack Crack Length Crack Growth Rate Fatigue Crack Growth Crack Closure 
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Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • Z. Mei
    • 1
  • C. Krenn
    • 1
  • J. W. MorrisJr.
    • 1
  1. 1.Center for Advanced Materials, Lawrence Berkeley Laboratory and Department of Materials Science and Mineral EngineeringUniversity of CaliforniaBerkeleyUSA

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