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Crack growth in a single crystal superalloy at elevated temperature

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Abstract

The influence of temperature and frequency on the crack propagation behavior of a single crystal superalloy has been investigated. At applied stress intensities approaching the fracture toughness, failure at all temperatures is associated with the fracture of script carbides ahead of the crack tip. At low and intermediate levels of ΔK the fatigue crack growth behavior is influenced by the temperature and frequency. At room temperature crack growth is found to occur by failure on {111} planes; at 600 °C and 850 °C crack growth is parallel to {100} . It has been shown that this behavior is not attributable to environmental interactions but arises from the morphology and distribution of the strengthening γ’ precipitate. Dislocations within the crack tip plastic zone are contained within the matrix, and crack propagation occurs primarily within the γ matrix by plasticity-controlled failure.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Engineering, Lehigh University, Whitaker Lab #5, 18015, Bethlehem, PA

    J. S. Crompton (Research Associate)

  2. Department of Metallurgy and Science of Materials, University of Oxford, Parks Road, Oxford, UK

    J. W. Martin (Lecturer)

Authors
  1. J. S. Crompton
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  2. J. W. Martin
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Crompton, J.S., Martin, J.W. Crack growth in a single crystal superalloy at elevated temperature. Metall Trans A 15, 1711–1719 (1984). https://doi.org/10.1007/BF02666354

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  • DOI: https://doi.org/10.1007/BF02666354

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