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

Kolb M, Zenk C, Kirzinger A, Povstugar I, Raabe D, Neumeier S, Göken M (2017)

Publication Status: Published

Publication Type: Journal article

Publication year: 2017

Journal

Publisher: CAMBRIDGE UNIV PRESS

Book Volume: 32

Pages Range: 2551-2559

Journal Issue: 13

DOI: 10.1557/jmr.2017.242

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 gamma'-strengthened Co-base superalloys is addressed. Atom probe tomography reveals that Re partitions preferentially to the gamma phase, but not as pronounced as in ni-base superalloys. Nanoindentation and micro-pillar compression tests of the gamma' phase indicate an increase of the hardness and the critical resolved shear stress caused by a considerable concentration of Re in the gamma' 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 gamma and hence a slightly reduced effective diffusion coefficient, a smaller diffusion barrier of Re in Cocompared to Ni, a slightly lower lattice misfit and gamma' volume fraction of the Re-containing alloy, are discussed.

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Involved external institutions

Max-Planck-Institut für Eisenforschung GmbH (MPIE) / Max Planck Institute for Iron Research Germany (DE)

How to cite

APA:

Kolb, M., Zenk, C., Kirzinger, A., Povstugar, I., Raabe, D., Neumeier, S., & Göken, M. (2017). Influence of rhenium on γ′-strengthened cobalt-base superalloys. Journal of Materials Research, 32(13), 2551-2559. https://dx.doi.org/10.1557/jmr.2017.242

MLA:

Kolb, Markus, et al. "Influence of rhenium on γ′-strengthened cobalt-base superalloys." Journal of Materials Research 32.13 (2017): 2551-2559.

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