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Effect of Environment on Fatigue and Creep Crack Growth in Inconel X-750 at Elevated Temperature

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Abstract

The fatigue crack growth rates (FCGR) of Inconel X-750 were measured in air and in vacuum at 25 °C and 650 °C as a function of test frequency. The wave shape was triangular and the frequency varied from 10 Hz to 0.01 Hz. The creep crack growth rates (CCGR) were also measured on single edge notch specimens at 650 °C in air and in purified argon. For a givenAK, the FCGR increases when temperature increases and frequency decreases. At low frequency the FCGR approach the creep crack growth rates. The mode of fracture changes from transgranular at 10 Hz to intergranular at 0.01 Hz. The effect of air environment is to accelerate the transition from transgranular to intergranular fracture modes with decreasing frequency. The role of oxidation in accelerating crack growth rate in fatigue and in creep is discussed in detail.

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Authors and Affiliations

  1. CNR-LTM, Istituto dei Materiali Metallici non Tradizionali, P. O. Box 4394, Milan, Italy

    F. Gabrielli (Research Scientist)

  2. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 02139, Cambridge, MA

    R. M. Pelloux (Professor of Materials Engineering)

Authors
  1. F. Gabrielli
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  2. R. M. Pelloux
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F. GABRIELLI, was formerly a visiting scientist at Massachusetts Institute of Technology.

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Gabrielli, F., Pelloux, R.M. Effect of Environment on Fatigue and Creep Crack Growth in Inconel X-750 at Elevated Temperature. Metall Trans A 13, 1083–1090 (1982). https://doi.org/10.1007/BF02643406

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  • DOI: https://doi.org/10.1007/BF02643406

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