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Sulfidation Characteristics of an Advanced Superalloy and Comparison with Other Superalloys Intended for Gas Turbine Use

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Abstract

Sulfidation may occur even in an overall oxidizing environment beneath a corrosion product which assumes the role of a diffusion barrier allowing sulfur species transport at a faster rate when compared with that of oxygen species. The current paper presents sulfidation characteristics of an advanced single-crystal nickel-based superalloy (ANS) and compares performance with IN 792 and CMSX-4 superalloys. The results showed that all the superalloys were highly vulnerable to sulfidation and their lives were significantly reduced. Among them, the ANS was more susceptible to sulfidation and its life was reduced considerably. This is attributed to the changed chemistry of the advanced alloy. The results for ANS are compared with its oxidation data and the difference in its behavior is discussed. A degradation mechanism, which represents the deterioration of ANS under sulfidation conditions, is proposed based on the results obtained from different techniques. Finally, the necessity of protective coatings for shielding against high temperature sulfidation for potential application in enhanced efficiency of gas turbine engines is emphasized.

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Acknowledgments

The first author (IG) would like to thank the European Commission for providing financial assistance as a Marie Curie Fellow. He would also like to express his gratitude to Prof. P. Rama Rao, ARCI, and Dr.G. Malakondaiah, Director, DMRL, for their support and constant encouragement.

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Authors and Affiliations

  1. Aeronautical Materials Division, Defence Metallurgical Research Laboratory, Kanchanbagh PO, Hyderabad, 500 058, India

    I. Gurrappa (Senior Scientist)

  2. M.V.S.R. Engineering College, Nadargul, Hyderabad, 501 510, India

    I. V. S. Yashwanth (Student)

  3. Materials Expro North Sea Ltd., Stirling, FK7 9JQ, U.K.

    J. S. Burnell-Gray (Team Leader)

Authors
  1. I. Gurrappa
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  2. I. V. S. Yashwanth
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  3. J. S. Burnell-Gray
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Corresponding author

Correspondence to I. Gurrappa.

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Manuscript submitted October 16, 2012.

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Gurrappa, I., Yashwanth, I.V.S. & Burnell-Gray, J.S. Sulfidation Characteristics of an Advanced Superalloy and Comparison with Other Superalloys Intended for Gas Turbine Use. Metall Mater Trans A 44, 5270–5280 (2013). https://doi.org/10.1007/s11661-013-1859-8

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  • DOI: https://doi.org/10.1007/s11661-013-1859-8

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