Oxidation-Related Microstructural Changes at a Crack Tip in Waspaloy After Elevated-Temperature Dwell-Fatigue Testing

Abstract

Using advanced aberration-corrected scanning transmission electron microscopy coupled with high-resolution energy-dispersive spectroscopy techniques, transitions to microstructure and composition occurring at a grain boundary (GB) crack-tip in Waspaloy after dwell-fatigue at 704 °C are characterized at the nano to atomic scale. The simple microstructure of this γ/γ′ superalloy, which enables elucidation of oxygen effect ahead of the oxide intrusion—dissolution of the precipitates fostering selective segregation of Al to the GB to form oxides—has been experimentally observed.

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The authors would like to thank Rolls-Royce Corporation for their material and financial supports for this research.

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Correspondence to G. B. Viswanathan.

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Manuscript submitted July 1, 2019.

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Viswanathan, G.B., Mills, D.E. & Mills, M.J. Oxidation-Related Microstructural Changes at a Crack Tip in Waspaloy After Elevated-Temperature Dwell-Fatigue Testing. Metall Mater Trans A 50, 5574–5580 (2019). https://doi.org/10.1007/s11661-019-05499-0

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