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Influence of topologically closed packed phase formation on creep rupture life of directionally solidified nickel-base superalloys

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Abstract

Several experimental superalloy compositions based on the alloy IN792 were investigated. Creep rupture properties were measured and microstructures in the as-heat-treated condition and after creep rupture testing were evaluated. Two types of topologically closed packed (TCP) phases have been observed. Type 1 occurs in alloys with increased additions of the γ′-formers Al and Ta and shows detrimental effects on creep rupture life. Type 2 precipitates in Re-containing alloys are much smaller in size and volume fraction than type 1 and are found not to influence the creep rupture properties. The different effect of type 1 and 2 TCP phases can be rationalized in terms of the amount of precipitate and the resulting matrix depletion of solid solution strengtheners.

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Authors and Affiliations

  1. the Department of Material Sciences, WTM Institute, 91058, Erlangen, Germany

    A. Volek & R. F. Singer

  2. the Department of Materials and Chemical Engineering, Osnabrück University of Applied Sciences, 49009, Osnabrück, Germany

    R. Buergel

  3. Doncasters Precision Castings Bochum GmbH, 44725, Bochum, Germany

    J. Grossmann

  4. Department of Materials Science, If W Institute, Technical University of Darmstadt, 64229, Darmstadt, Germany

    Y. Wang

Authors
  1. A. Volek
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  2. R. F. Singer
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  3. R. Buergel
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  4. J. Grossmann
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  5. Y. Wang
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Volek, A., Singer, R.F., Buergel, R. et al. Influence of topologically closed packed phase formation on creep rupture life of directionally solidified nickel-base superalloys. Metall Mater Trans A 37, 405–410 (2006). https://doi.org/10.1007/s11661-006-0011-4

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  • DOI: https://doi.org/10.1007/s11661-006-0011-4

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