The effect of Ru on precipitation of topologically close packed phases in Re-containing Ni base superalloys: Quantitative FIB-SEM investigation and 3D image modeling

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Details zur Publikation

Autor(en): Matuszewski K, Rettig R, Singer R
Verlag: EDP Sciences
Jahr der Veröffentlichung: 2014
Band: 14
Sprache: Englisch


Abstract


A new approach to clarify the ruthenium effect on the precipitation of topologically close packed (TCP) phases is described in the paper. It is based on focused ion beam-scanning electron microscopy (FIB-SEM) dual beam methodology as well as three-dimensional imaging. The high-temperature capabilities of nickel base superalloys can be improved by alloying with refractory elements. With excessive refractory element content or excessive exposure to high temperature, brittle TCP phases precipitate resulting in a drop of strength. The undesirable phase transformation can be suppressed by addition of ruthenium. Although the effect is well known, its real mechanism remains open. In the present paper, the volume fraction and particle density, as well as the exact three-dimensional morphology of TCP phases as measured by FIB-SEM will be presented. The effect of ruthenium content and time of exposure is studied quantitatively. The results show that increased Ru additions slow down all stages of phase transformation and also reduce the equilibrium TCP volume fraction. The Ru effect might be due to either reduced driving force for precipitation or reduced interfacial energy. © 2014 Owned by the authors, published by EDP Sciences.



FAU-Autoren / FAU-Herausgeber

Matuszewski, Kamil
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Rettig, Ralf Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Singer, Robert Prof. Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)


Zitierweisen

APA:
Matuszewski, K., Rettig, R., & Singer, R. (2014). The effect of Ru on precipitation of topologically close packed phases in Re-containing Ni base superalloys: Quantitative FIB-SEM investigation and 3D image modeling. Giens: EDP Sciences.

MLA:
Matuszewski, Kamil, Ralf Rettig, and Robert Singer. "The effect of Ru on precipitation of topologically close packed phases in Re-containing Ni base superalloys: Quantitative FIB-SEM investigation and 3D image modeling." Proceedings of the 2nd European Symposium on Superalloys and Their Applications, EUROSUPERALLOYS 2014, Giens EDP Sciences, 2014.

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