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Boron Depletion in a Nickel Base Superalloy Induced by High Temperature Oxidation

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Abstract

The conventionally cast Ni-base superalloy Rene 80 containing 90 wt ppm boron was oxidized in synthetic air at 850–1,050 °C for times up to 100 h. Extensive microstructural studies using GD-OES and SEM/WDX/EBSD revealed formation of a porous chromia scale containing TiO2 precipitates at its outer surface and semi-continuous layers of BCrO3 and CrTi2O5 at its base. The development of B-rich oxide in the scale is related to its high thermodynamic stability and the high alloy boron diffusivity. Its enrichment in the oxide scale resulted in B-depletion from the alloy matrix, which was extremely rapid at 1,050 °C, draining the boron content of a 2 mm thick alloy coupon in 100 h. After 100 h exposure at 950 °C, the B-content dropped below 40 wt ppm, but only minor depletion was found after 100 h at 850 °C. Predictions of B-depletion based on calculation of its diffusion from a thin, flat sheet were in good agreement with experiment at 1,050 °C. Precipitation of B-containing compounds (borides) within the alloy is shown to account qualitatively for slower B-outdiffusion at lower temperatures.

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Acknowledgments

The authors would like to acknowledge the Deutsche Forschungsgemeinshaft (DFG) for funding part of this work under Grant No. NA 615 2-1. Assistance with ICP-OES analysis provided by H. Lippert from the Central Institute for Engineering, Electronics and Analytics, ZEA-3, Forschungszentrum Jülich GmbH is greatly appreciated. The authors are grateful to the following colleagues in the Institute of Energy and Climate Research of the Forschungszentrum Jülich GmbH for assistance in the experimental work: R. Mahnke and M. Borzikov for the oxidation experiments, V. Gutzeit and J. Bartsch for metallographic studies, M. Ziegner for XRD analyses and Dr. E. Wessel and Dr. D. Grüner for SEM investigations.

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Authors and Affiliations

  1. Institute for Energy and Climate Research, IEK-2, Forschungszentrum Jülich GmbH, 52425, Jülich, Germany

    A. Jalowicka, W. Nowak, D. Naumenko & W. J. Quadakkers

  2. School of Materials Science and Engineering, University of New South Wales, Sydney, NSW, 2052, Australia

    D. J. Young

  3. Central Institute for Engineering, Electronics and Analytics, ZEA-3, Forschungszentrum Jülich GmbH, 52425, Jülich, Germany

    V. Nischwitz

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  1. A. Jalowicka
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  2. W. Nowak
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  3. D. J. Young
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  4. V. Nischwitz
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  5. D. Naumenko
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  6. W. J. Quadakkers
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Correspondence to A. Jalowicka.

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Jalowicka, A., Nowak, W., Young, D.J. et al. Boron Depletion in a Nickel Base Superalloy Induced by High Temperature Oxidation. Oxid Met 83, 393–413 (2015). https://doi.org/10.1007/s11085-015-9529-4

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  • DOI: https://doi.org/10.1007/s11085-015-9529-4

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