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Predicting Effect of Base Alloy Composition on Oxidation- and Interdiffusion-Induced Degradation of an MCrAlY Coating

  • Nuclear Materials, Oxidation, Supercritical CO2, and Corrosion Behavior
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Abstract

The effect of two base alloys, viz. Ni-based superalloy Rene 80 and Co-based alloy ECY768, on the oxidation and interdiffusion behavior of a NiCoCrAlY Re-containing coating after exposure for up to 2000 h at 1050°C in synthetic air has been evaluated. Scanning electron microscopy with energy-dispersive x-ray spectroscopy was employed to measure the element concentrations, and phases were identified by electron backscatter diffraction. Significant depletion of β-NiAl within the coating, enrichment of γ′-phase, and formation of µ-phase in the alloy and Kirkendall porosity at the coating–alloy interface were observed in the coating on Rene 80. In contrast, the coating on the Co-base alloy ECY768 formed large amounts of Cr/Re-rich carbides and the depletion of β-NiAl phase was less pronounced than that observed on the Ni-base alloy. These findings could be interpreted using an in-house-developed thermodynamic–kinetic CALPHAD-based computer model.

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Acknowledgements

The authors are grateful to Mr. H. Cosler and Ms. A. Kick for carrying out the high-temperature exposures and to Mr. V. Gutzeit for optical metallography investigations. The authors are also thankful to the European Union for providing financial support (Collaborative Project: FP7-239349 with acronym: H2-IGCC) to carry out the project. The authors thank Flame Spray for providing the aluminised specimens.

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Authors and Affiliations

  1. Forschungszentrum Juelich GmbH, IEK-2, 52428, Juelich, Germany

    R. Pillai, E. Wessel, D. Naumenko & W. J. Quadakkers

  2. Department of Materials Science, Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, al. Powstancow Warszawy 12, 35-959, Rzeszow, Poland

    W. J. Nowak

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  1. R. Pillai
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  2. E. Wessel
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  3. W. J. Nowak
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  4. D. Naumenko
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  5. W. J. Quadakkers
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Correspondence to R. Pillai.

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Pillai, R., Wessel, E., Nowak, W.J. et al. Predicting Effect of Base Alloy Composition on Oxidation- and Interdiffusion-Induced Degradation of an MCrAlY Coating. JOM 70, 1520–1526 (2018). https://doi.org/10.1007/s11837-018-2950-9

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  • DOI: https://doi.org/10.1007/s11837-018-2950-9

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