Abstract
Delayed interfacial scale failure takes place after cooling for samples of a Ni(Pt)Al-coated CMSX4 single crystal superalloy, cycled at 1150 °C for up to 2000 h. One sample exhibited premature coating grain boundary wrinkling, alumina scale spallation to bare metal, and a final weight loss of 3.3 mg/cm2. Spallation under ambient conditions was monitored with time after cooldown and was found to continue for 24 h. This produced up to 0.05 mg/cm2 additional loss for each hold, accumulating 0.7 mg/cm2 (20% of the total) over the course of the test. After test termination, water immersion produced an additional 0.15 mg/cm2 loss (a duplicate sample produced much less wrinkling and time dependent spalling, maintaining a net weight gain). The results are consistent with the general phenomena of moisture-induced delayed spallation (MIDS) of mature, distressed alumina scales formed on oxidation resistant M-Al alloys. Relative ambient humidity is discussed as the factor controlling adsorbed moisture, reaction with the substrate, and hydrogen effects on interface strength.
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Acknowledgements
The author is grateful for SEM/EDS analyses by Dr. A. Garg, NASA Glenn Research Center, insightful discussions with V.K. Tolpygo, Honeywell, and helpful comments from K.S. Murphy, Howmet, and B. Gleeson, University of Pittsburgh. This work was initiated from support by Dr. Kang Lee, Rolls Royce and Donna Ballard, WPAFB, as part of a coatings life prediction study under the Metals Affordability Initiative.
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Smialek, J.L. Moisture-Induced Delayed Alumina Scale Spallation on a Ni(Pt)Al Coating. Oxid Met 72, 259–278 (2009). https://doi.org/10.1007/s11085-009-9159-9
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DOI: https://doi.org/10.1007/s11085-009-9159-9