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Isothermal fatigue of an aluminide-coated single-crystal superalloy: Part I

Metallurgical and Materials Transactions A volume 27, pages 353–361 (1996)Cite this article

Abstract

The isothermal fatigue behavior of a high-activity aluminide-coated single-crystal superalloy was studied in air at test temperatures of 600 °, 800 °, and 1000 °. Tests were performed using cylindrical specimens under strain control at ≈0.25 Hz; total strain ranges from 0.5 to 1.6 pct were investigated. At 600 °, crack initiation occurred at brittle coating cracks, which led to a significant reduction in fatigue life compared to the uncoated alloy. Fatigue cracks grew from the brittle coating cracks initially in a stage II manner with a subsequent transition to crystallographic stage I fatigue. At 800 ° and 1000 °, the coating failed quickly by a fatigue process due to the drastic reduction in strength above 750 °, the ductile-brittle transition temperature. These cracks were arrested or slowed by oxidation at the coating-substrate interface and only led to a detriment in life relative to the uncoated material for total strain ranges of 1.2 pct and above 800 °. The presence of the coating was beneficial at 800 ° for total strain ranges less than 1.2 pct. No effect of the coating was observed at 1000 °. Crack growth in the substrate at 800 ° was similar to 600 °; at 1000 °, greater plasticity and oxidation were observed and cracks grew exclusively in a stage II manner.

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Authors and Affiliations

  1. Argonne National Laboratory, 83403, Idaho Falls, ID

    T. C. Totemeier (Metallurgical Engineer)

  2. Rolls-Royce Aerospace Group, DE24 8BJ, Derby, UK

    J. E. King (Head of Materials)

Authors
  1. T. C. Totemeier
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  2. J. E. King
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Additional information

Formerly Research Student, Department of Materials Science and Metallurgy, University of Cambridge.

Formerly Lecturer, Department of Materials Science and Metallurgy, University of Cambridge CB2 3QZ, United Kingdom.

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Totemeier, T.C., King, J.E. Isothermal fatigue of an aluminide-coated single-crystal superalloy: Part I. Metall Mater Trans A 27, 353–361 (1996). https://doi.org/10.1007/BF02648412

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  • DOI: https://doi.org/10.1007/BF02648412

Keywords

  • Fatigue
  • Material Transaction
  • Fatigue Crack
  • Fatigue Life
  • Fatigue Crack Growth