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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Heinze, Stefan
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2025High-temperature-driven degradation analysis and modelling of an industrial gas turbine applicable γ/β NiCoCrAlYRe coating– Part II: Diffusion modelling and experimental validation under isothermal conditionscitations
- 2024Proposal for All-Electrical Skyrmion Detection in van der Waals Tunnel Junctionscitations
- 2023Influence of Two-Step Heat Treatments on Microstructure and Mechanical Properties of a β-Solidifying Titanium Aluminide Alloy Fabricated via Electron Beam Powder Bed Fusioncitations
- 2023Influence of the deposition process on the Cr2AlC phase formation during heat treatment of Cr-Al-C thin filmscitations
- 2023Influence of the deposition process on the Cr$_2$AlC phase formation during heat treatment of Cr-Al-C thin filmscitations
- 2023Influence of the deposition process and substrate on microstructure, phase composition, and residual stress state on as-deposited Cr-Al-C coatingscitations
- 2023Controlled Formation of Porous 2D Lattices from C3‐symmetric Ph6-Me‐Tribenzotriquinacene‐OAc3citations
- 2022Influence of Two-Step Heat Treatments on Microstructure and Mechanical Properties of a β-Solidifying Titanium Aluminide Alloy Fabricated via Electron Beam Powder Bed Fusioncitations
- 2022Influence of the Deposition Process and Substrate on Microstructure, Phase Composition, and Residual Stress State on As-Deposited Cr-Al-C Coatingscitations
- 2019Thermodynamic calculation and experimental analysis of critical phase transformations in HVOF-sprayed NiCrAlY-coating alloyscitations
- 2018Magnetic skyrmions: structure, stability, and transport phenomena
- 2018B – T phase diagram of Pd/Fe/Ir(111) computed with parallel tempering Monte Carlocitations
- 2014Steigerung der Leistungsfähigkeit von Hartmetallwerkzeugen in der Hartbearbeitung
- 2014Tailoring magnetic skyrmions in ultra-thin transition metal filmscitations
- 2013Thermoelectric properties of oxide heterostructures ; Thermoelektrische Eigenschaften von Oxidheterostrukturen
Places of action
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article
Thermodynamic calculation and experimental analysis of critical phase transformations in HVOF-sprayed NiCrAlY-coating alloys
Abstract
S.924-938 ; Most of the current high temperature protective NiCrAlY-type coatings for stationary gas turbines are configured for base-load operation. During service at elevated temperatures, phase transformations occur which ultimately lead to a microstructural evolution and thus might have a substantial influence on service relevant materials properties. In consequence, these coating alloys need to be adapted for operation in high-cyclic and/or peak-loading conditions. The present investigation is focusing on the microstructural evolution of nine different NiCrAlY-coatings in the temperature range of up to 1150 °C. The study especially aims at determining the v-(NiAl) and g'-(Ni3Al) phase transformation, which can have a substantial impact on the coefficient of thermal expansion, or the materials deformation behaviour respectively. For this, a combination of computational thermodynamics (Thermo-Calc 2015b, TCNi6 database) validated by dilatometry and X-ray diffraction was used. In addition, the obtained results were cross-checked using scanning electron microscopy and energy dispersive spectroscopy on water quenched, free-standing coating alloy specimens. In general, a good agreement between the thermodynamic equilibrium calculations, dilatometry and X-ray diffraction, as well as the microstructure analysis after water quenching was found with respect to the critical phase transformations of a-(Cr), v-(NiAl) and g'-(Ni3Al) precipitates in the g-(Ni) matrix. The great potential of computational thermodynamics combined with dilatometry and X-ray diffraction for the evaluation of critical phase transformations was proven for the different coating alloys. Using this methodology, novel and very promising NiCrAlY-coating compositions, without detrimental phase transformations around 1000 °C, were identified for the application on heavy-duty gas turbines hot gas path components. This manuscript presents a summary of the main results. ; 357