Predicting Effect of Base Alloy Composition on Oxidation- and Interdiffusion-Induced Degradation of an MCrAlY Coating

Predicting Effect of Base Alloy Composition on Oxidation- and Interdiffusion-Induced Degradation... JOM https://doi.org/10.1007/s11837-018-2950-9 2018 The Minerals, Metals & Materials Society NUCLEAR MATERIALS, OXIDATION, SUPERCRITICAL CO2, AND CORROSION BEHAVIOR Predicting Effect of Base Alloy Composition on Oxidation- and Interdiffusion-Induced Degradation of an MCrAlY Coating 1,3 1 2 1 R. PILLAI , E. WESSEL, W.J. NOWAK, D. NAUMENKO, and W.J. QUADAKKERS 1.—Forschungszentrum Juelich GmbH, IEK-2, 52428 Juelich, Germany. 2.—Department of Materials Science, Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, al. Powstancow Warszawy 12, 35-959 Rzeszow, Poland. 3.—e-mail: r.pillai@fz-juelich.de The effect of two base alloys, viz. Ni-based superalloy Rene 80 and Co-based alloy ECY768, on the oxidation and interdiffusion behavior of a NiCoCrAlY Re-containing coating after exposure for up to 2000 h at 1050C in synthetic air has been evaluated. Scanning electron microscopy with energy-dispersive x-ray spectroscopy was employed to measure the element concentrations, and phases were identified by electron backscatter diffraction. Significant deple- tion of b-NiAl within the coating, enrichment of c¢-phase, and formation of l- phase in the alloy and Kirkendall porosity at the coating–alloy interface were observed in the coating on Rene 80. In contrast, the coating on the Co-base alloy ECY768 formed large amounts of Cr/Re-rich carbides and the depletion of b-NiAl phase was less pronounced http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png JOM Springer Journals

Predicting Effect of Base Alloy Composition on Oxidation- and Interdiffusion-Induced Degradation of an MCrAlY Coating

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Publisher
Springer US
Copyright
Copyright © 2018 by The Minerals, Metals & Materials Society
Subject
Engineering; Engineering, general; Chemistry/Food Science, general; Physics, general; Environment, general; Earth Sciences, general
ISSN
1047-4838
eISSN
1543-1851
D.O.I.
10.1007/s11837-018-2950-9
Publisher site
See Article on Publisher Site

Abstract

JOM https://doi.org/10.1007/s11837-018-2950-9 2018 The Minerals, Metals & Materials Society NUCLEAR MATERIALS, OXIDATION, SUPERCRITICAL CO2, AND CORROSION BEHAVIOR Predicting Effect of Base Alloy Composition on Oxidation- and Interdiffusion-Induced Degradation of an MCrAlY Coating 1,3 1 2 1 R. PILLAI , E. WESSEL, W.J. NOWAK, D. NAUMENKO, and W.J. QUADAKKERS 1.—Forschungszentrum Juelich GmbH, IEK-2, 52428 Juelich, Germany. 2.—Department of Materials Science, Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, al. Powstancow Warszawy 12, 35-959 Rzeszow, Poland. 3.—e-mail: r.pillai@fz-juelich.de The effect of two base alloys, viz. Ni-based superalloy Rene 80 and Co-based alloy ECY768, on the oxidation and interdiffusion behavior of a NiCoCrAlY Re-containing coating after exposure for up to 2000 h at 1050C in synthetic air has been evaluated. Scanning electron microscopy with energy-dispersive x-ray spectroscopy was employed to measure the element concentrations, and phases were identified by electron backscatter diffraction. Significant deple- tion of b-NiAl within the coating, enrichment of c¢-phase, and formation of l- phase in the alloy and Kirkendall porosity at the coating–alloy interface were observed in the coating on Rene 80. In contrast, the coating on the Co-base alloy ECY768 formed large amounts of Cr/Re-rich carbides and the depletion of b-NiAl phase was less pronounced

Journal

JOMSpringer Journals

Published: May 30, 2018

References

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