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Influence of rhenium on γ′-strengthened cobalt-base superalloys

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Abstract

The element Re is known to be a very potent strengthener concerning the creep properties of Ni-base superalloys. In this paper the influence of Re on the properties of new γ′-strengthened Co-base superalloys is addressed. Atom probe tomography reveals that Re partitions preferentially to the γ phase, but not as pronounced as in ni-base superalloys. Nanoindentation and micro-pillar compression tests of the γ′ phase indicate an increase of the hardness and the critical resolved shear stress caused by a considerable concentration of Re in the γ′ phase. Creep investigations show that the positive effect of Re is by far not as pronounced as in Ni-base superalloys. Several effects, which can contribute to this behavior, such as the lower Re concentration in γ and hence a slightly reduced effective diffusion coefficient, a smaller diffusion barrier of Re in Co compared to Ni, a slightly lower lattice misfit and γ′ volume fraction of the Re-containing alloy, are discussed.

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ACKNOWLEDGMENTS

The authors acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG) through projects A4, A6, and B3 of the Collaborative Research Center SFB/TR 103 “From Atoms to Turbine Blades–a Scientific Approach for Developing the Next Generation of Single Crystal Superalloys”. The authors would like to thank Jan Philipp Liebig for milling the micro-pillars.

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Authors and Affiliations

  1. Friedrich-Alexander-Universität Erlangen-Nürnberg, Materials Science & Engineering, Institute I, Erlangen, 91058, Germany

    Markus Kolb, Christopher H. Zenk, Anna Kirzinger, Steffen Neumeier & Mathias Göken

  2. Department of Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung, Düsseldorf, 40237, Germany

    Ivan Povstugar & Dierk Raabe

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  1. Markus Kolb
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Correspondence to Markus Kolb.

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This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/editor-manuscripts/.

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Kolb, M., Zenk, C.H., Kirzinger, A. et al. Influence of rhenium on γ′-strengthened cobalt-base superalloys. Journal of Materials Research 32, 2551–2559 (2017). https://doi.org/10.1557/jmr.2017.242

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  • DOI: https://doi.org/10.1557/jmr.2017.242

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