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Precious-metal-modified nickel-based superalloys: Motivation and potential industry applications

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Abstract

Nickel-based superalloys are extensively used in the hot sections of gas turbine engines and other propulsive power machines because they possess an excellent combination of high-temperature strength and resistance to oxidation and hot corrosion degradation. The γ-γ′ microstructure inherent in nickel-based superalloys is designed with respect to composition and morphology so as to achieve a balance of strength versus environmental resistance. Often, aluminide and platinum-modified aluminide coatings are applied to the component surface to further improve the resistance to environmental degradation by supporting the formation of a protective aluminum oxide scale. The potential exists to utilize alloying concepts from novel platinum and hafnium-modified γ-γ′ diffusion coatings so as to create in-situ a new class of superalloy that combines enhanced environmental resistance while maintaining sufficient strength at high temperatures. This paper describes how precious-metal-modified superalloys can offer advantages for structural applications in gas turbine engines. Several examples that illustrate component performance benefits are also presented.

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Authors and Affiliations

  1. Rolls-Royce Corporation, P.O. Box 420, Speed Code W-08, Indianapolis, IN, 46206, USA

    A. Bolcavage

  2. Rolls-Royce North American Technologies, Inc., Indianapolis, IN, USA

    R. C. Helmink

Authors
  1. A. Bolcavage
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  2. R. C. Helmink
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Correspondence to A. Bolcavage.

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Bolcavage, A., Helmink, R.C. Precious-metal-modified nickel-based superalloys: Motivation and potential industry applications. JOM 62, 41–44 (2010). https://doi.org/10.1007/s11837-010-0154-z

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  • DOI: https://doi.org/10.1007/s11837-010-0154-z

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