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Discontinuous Precipitation and Phase Stability In Re- and Ru-Containing Nickel-Base Superalloys

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Abstract

The phase stability of nickel-base superalloys has been investigated using a new in-house-designed alloy series with stepwise increased additions of Re and Ru at otherwise fixed atomic fractions of alloying elements. Results presented in this study are focused on the lesser-known topologically closed packed (TCP) formation of columnar colonies or so-called discontinuous precipitation. A detailed investigation of these colonies allowed for identifying compositional changes during the growth process and for providing a three-dimensional (3-D) illustration of the TCP phases within these colonies. The results were used to compare the colony growth process with existing growth models. Furthermore, the influence of Re and Ru on the appearance of discontinuous precipitation has been investigated by means of colony width and the effect on creep properties. Larson-Miller plots are given to illustrate the creep strength of directionally solidified samples with and without TCP colonies compared with single crystalline samples free from TCP colonies.

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Acknowledgments

This work was financially supported by the German Research Foundation (DFG) in the framework of the DFG research group (Graduiertenkolleg) 1229 “Stable and Metastable Multiphase Systems for High Temperature Applications.” We would like to thank Karl Nigge for measurements with the EPMA.

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Authors and Affiliations

  1. Institute of Science and Technology of Metals, Department of Materials Science and Engineering, University Erlangen-Nuremberg, Martensstr. 5, D-91058, Erlangen, Germany

    Astrid Heckl (Research Assistant) & Robert F. Singer (Head)

  2. Institute General Materials Properties, Department of Materials Science and Engineering, University Erlangen-Nuremberg, Erlangen, Germany

    Samir Cenanovic (Research Assistant) & Mathias Göken (Head)

Authors
  1. Astrid Heckl
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  2. Samir Cenanovic
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  3. Mathias Göken
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  4. Robert F. Singer
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Correspondence to Astrid Heckl.

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Manuscript submitted September 29, 2010.

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Heckl, A., Cenanovic, S., Göken, M. et al. Discontinuous Precipitation and Phase Stability In Re- and Ru-Containing Nickel-Base Superalloys. Metall Mater Trans A 43, 10–19 (2012). https://doi.org/10.1007/s11661-011-0833-6

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