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Title: Simulating the effect of aluminizing on a CoNiCrAlY-coated Ni-base superalloy

Abstract

MCrAlY (M = Ni, Co) coatings are commonly used on gas-turbine components as oxidation resistant overlay coatings and bondcoats for thermal barrier systems. Here, we focus on the effect of the aluminizing process on the CoNiCrAlY coating microstructure. In the as-received condition the outer part of the coating consisted mostly of β-(Ni,Co)Al with interspersed precipitates of Cr-rich carbide and Cr-rich boride precipitates. Formation of σ-CoCr was observed at the interface between the β-layer and the inner initial CoNiCrAlY microstructure. Scanning electron microscopy (SEM) combined with energy and wavelength-dispersive X-ray spectroscopy (EDX/WDX) was employed to characterize the aluminized CoNiCrAlY coating. Phases were then identified by electron backscatter diffraction (EBSD). Detailed microstructural studies of the coating were corroborated with the help of coupled thermodynamic-kinetic calculations to model the aluminizing process. The calculations were performed with the in-house developed code employing the commercially available thermodynamic and kinetic databases (ThermoCalc). The mechanisms of the observed microstructural changes were elucidated with the help of the modelling donclusions.

Authors:
 [1];  [2];  [2];  [2];  [3];  [3];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Forschungszentrum Juelich GmbH (Germany)
  3. MAN Energy Solutions SE, Oberhausen (Germany)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1531218
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Calphad
Additional Journal Information:
Journal Volume: 65; Journal Issue: C; Journal ID: ISSN 0364-5916
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Ni-base superalloy; Multi-layered coating; Interdiffusion; Coupled thermodynamic-kinetic modelling

Citation Formats

Pillai, R., Jalowicka, A., Galiullin, T., Naumenko, D., Ernsberger, M., Herzog, R., and Quadakkers, W. J. Simulating the effect of aluminizing on a CoNiCrAlY-coated Ni-base superalloy. United States: N. p., 2019. Web. doi:10.1016/j.calphad.2019.04.004.
Pillai, R., Jalowicka, A., Galiullin, T., Naumenko, D., Ernsberger, M., Herzog, R., & Quadakkers, W. J. Simulating the effect of aluminizing on a CoNiCrAlY-coated Ni-base superalloy. United States. doi:10.1016/j.calphad.2019.04.004.
Pillai, R., Jalowicka, A., Galiullin, T., Naumenko, D., Ernsberger, M., Herzog, R., and Quadakkers, W. J. Tue . "Simulating the effect of aluminizing on a CoNiCrAlY-coated Ni-base superalloy". United States. doi:10.1016/j.calphad.2019.04.004.
@article{osti_1531218,
title = {Simulating the effect of aluminizing on a CoNiCrAlY-coated Ni-base superalloy},
author = {Pillai, R. and Jalowicka, A. and Galiullin, T. and Naumenko, D. and Ernsberger, M. and Herzog, R. and Quadakkers, W. J.},
abstractNote = {MCrAlY (M = Ni, Co) coatings are commonly used on gas-turbine components as oxidation resistant overlay coatings and bondcoats for thermal barrier systems. Here, we focus on the effect of the aluminizing process on the CoNiCrAlY coating microstructure. In the as-received condition the outer part of the coating consisted mostly of β-(Ni,Co)Al with interspersed precipitates of Cr-rich carbide and Cr-rich boride precipitates. Formation of σ-CoCr was observed at the interface between the β-layer and the inner initial CoNiCrAlY microstructure. Scanning electron microscopy (SEM) combined with energy and wavelength-dispersive X-ray spectroscopy (EDX/WDX) was employed to characterize the aluminized CoNiCrAlY coating. Phases were then identified by electron backscatter diffraction (EBSD). Detailed microstructural studies of the coating were corroborated with the help of coupled thermodynamic-kinetic calculations to model the aluminizing process. The calculations were performed with the in-house developed code employing the commercially available thermodynamic and kinetic databases (ThermoCalc). The mechanisms of the observed microstructural changes were elucidated with the help of the modelling donclusions.},
doi = {10.1016/j.calphad.2019.04.004},
journal = {Calphad},
number = C,
volume = 65,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
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This content will become publicly available on April 23, 2020
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