Influence of Different Annealing Atmospheres on the Mechanical Properties of Freestanding MCrAlY Bond Coats Investigated by Micro-Tensile Creep Tests

Giese S, Neumeier S, Bergholz J, Naumenko D, Quadakkers WJ, Vassen R, Göken M (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Metals MDPI

Book Volume: 9

Journal Issue: 6

DOI: 10.3390/met9060692

Abstract

The mechanical properties of low-pressure plasma sprayed (LPPS) MCrAlY (M = Ni, Co) bond coats, Amdry 386, Amdry 9954 and oxide dispersion strengthened (ODS) Amdry 9954 (named Amdry 9954 + ODS) were investigated after annealing in three atmospheres: Ar-O-2, Ar-H2O, and Ar-H-2-H2O. Freestanding bond coats were investigated to avoid any influence from the substrate. Miniaturized cylindrical tensile specimens were produced by a special grinding process and then tested in a thermomechanical analyzer (TMA) within a temperature range of 900-950 degrees C. Grain size and phase fraction of all bond coats were investigated by EBSD before testing and no difference in microstructure was revealed due to annealing in various atmospheres. The influence of annealing in different atmospheres on the creep strength was not very pronounced for the Co-based bond coats Amdry 9954 and Amdry 9954 + ODS in the tested conditions. The ODS bond coats revealed significantly higher creep strength but a lower strain to failure than the ODS-free Amdry 9954. The Ni-based bond coat Amdry 386 showed higher creep strength than Amdry 9954 due to the higher fraction of the beta -NiAl phase. Additionally, its creep properties at 900 degrees C were much more affected by annealing in different atmospheres. The bond coat Amdry 386 annealed in an Ar-H2O atmosphere showed a significantly lower creep rate than the bond coat annealed in Ar-O-2 and Ar-H-2-H2O atmospheres.

Authors with CRIS profile

Sven Giese Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

Nanomechanical and nanometrological characterisation of single-crystalline Ni-base superalloys (A06) (SFB/TRR 103) TRR 103: Vom Atom zur Turbinenschaufel - wissenschaftliche Grundlagen für eine neue Generation einkristalliner Superlegierungen Jan. 1, 2012 - Dec. 31, 2015

Involved external institutions

Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE)

How to cite

APA:

Giese, S., Neumeier, S., Bergholz, J., Naumenko, D., Quadakkers, W.J., Vassen, R., & Göken, M. (2019). Influence of Different Annealing Atmospheres on the Mechanical Properties of Freestanding MCrAlY Bond Coats Investigated by Micro-Tensile Creep Tests. Metals, 9(6). https://dx.doi.org/10.3390/met9060692

MLA:

Giese, Sven, et al. "Influence of Different Annealing Atmospheres on the Mechanical Properties of Freestanding MCrAlY Bond Coats Investigated by Micro-Tensile Creep Tests." Metals 9.6 (2019).

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