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

Published online by Cambridge University Press:  12 July 2017

Markus Kolb ,
Christopher H. Zenk ,
Anna Kirzinger ,
Ivan Povstugar ,
Dierk Raabe ,
Steffen Neumeier  and
Mathias Göken
Markus Kolb*
Affiliation:
Friedrich-Alexander-Universität Erlangen-Nürnberg, Materials Science & Engineering, Institute I, Erlangen 91058, Germany
Christopher H. Zenk
Affiliation:
Friedrich-Alexander-Universität Erlangen-Nürnberg, Materials Science & Engineering, Institute I, Erlangen 91058, Germany
Anna Kirzinger
Affiliation:
Friedrich-Alexander-Universität Erlangen-Nürnberg, Materials Science & Engineering, Institute I, Erlangen 91058, Germany
Ivan Povstugar
Affiliation:
Max-Planck-Institut für Eisenforschung, Department of Microstructure Physics and Alloy Design, Düsseldorf 40237, Germany
Dierk Raabe
Affiliation:
Max-Planck-Institut für Eisenforschung, Department of Microstructure Physics and Alloy Design, Düsseldorf 40237, Germany
Steffen Neumeier
Affiliation:
Friedrich-Alexander-Universität Erlangen-Nürnberg, Materials Science & Engineering, Institute I, Erlangen 91058, Germany
Mathias Göken
Affiliation:
Friedrich-Alexander-Universität Erlangen-Nürnberg, Materials Science & Engineering, Institute I, Erlangen 91058, Germany
*
a) Address all correspondence to this author. e-mail: markus.kolb@fau.de
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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.

Keywords

Conano-indentationmicrostructuretransmission electron microscopy (TEM)
Type
Invited Papers
Information
Journal of Materials Research , Volume 32 , Issue 13 , 14 July 2017 , pp. 2551 - 2559
Copyright
Copyright © Materials Research Society 2017 

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Footnotes

b)

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/.

Contributing Editor: Jürgen Eckert

References

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