Microtensile creep testing of freestanding MCrAlY bond coats

Journal article


Publication Details

Author(s): Giese S, Neumeier S, Amberger-Matschkal D, Bergholz J, Vaßen R, Göken M
Journal: Journal of Materials Research
Publication year: 2019
ISSN: 0884-2914
eISSN: 2044-5326


Abstract

Bond coats are essential in gas turbine technology for oxidation protection. Freestanding MCrAlY (M = Ni, Co) bond coats were investigated with respect to their creep strength at elevated temperatures. Three types of MCrAlY, a Ni-based bond coat Amdry 386, a Co-based bond coat Amdry 9954 and Amdry 9954 + 2 wt% Al2O3 (ODS = oxide dispersion strengthened) produced by low pressure plasma spraying, were analyzed. The two phase microstructure of the bond coats consists of a fcc γ-Ni solid solution and a B2 β-NiAl phase. Constant load experiments were performed in a thermomechanical analyzer at temperatures between 900 and 950 °C. Microtensile test specimens with a diameter of 450 μm were produced by a high-precision grinding and polishing process. Creep rupture was mainly due to void nucleation along the β-γinterfaces and grain boundaries. The time to failure is larger in Ni-based Amdry 386 compared to that in Co-based Amdry 9954 due to a higher fraction of the high-strength β-NiAl phase at test temperatures. The addition of ODS-particles in the Co-based bond coat Amdry 9954 resulted in a better creep resistance but lower ductility in comparison to ODS-particle-free Amdry 9954.


FAU Authors / FAU Editors

Giese, Sven
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Göken, Mathias Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Neumeier, Steffen Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)


External institutions with authors

Forschungszentrum Jülich / Research Centre Jülich (FZJ)


How to cite

APA:
Giese, S., Neumeier, S., Amberger-Matschkal, D., Bergholz, J., Vaßen, R., & Göken, M. (2019). Microtensile creep testing of freestanding MCrAlY bond coats. Journal of Materials Research. https://dx.doi.org/10.1557/jmr.2019.169

MLA:
Giese, Sven, et al. "Microtensile creep testing of freestanding MCrAlY bond coats." Journal of Materials Research (2019).

BibTeX: 

Last updated on 2019-05-06 at 12:23