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Effects of thermal cycling parameters on residual stresses in alumina scales of CoNiCrAlY and NiCoCrAlY bond coats [electronic resource].

Published
Washington, D.C. : United States. Office of the Assistant Secretary of Energy for Fossil Energy, 2014.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
608-614 : digital, PDF file
Additional Creators
Oak Ridge National Laboratory, United States. Office of the Assistant Secretary of Energy for Fossil Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
In this paper, furnace cycling experiments were performed on free-standing high-velocity oxygen-fuel bond coat samples to investigate the effect of material composition, surface texture, and cycling conditions on the average stresses in the formed oxide scales after cooling. The oxide scale thicknesses were determined by SEM image analyses and information about the stresses were acquired by photo-stimulated luminescence-spectroscopy. Additionally, the scale thickness dependent stress fields were calculated in finite-element analyses including approximation functions for the surface roughness derived on the basis of profilometry data. The evolution of the average residual stress as a function of oxide scale thickness was subject to stochastic fluctuations predominantly caused by local scale spallations. In comparison to the supplemental modeling results, thermal stresses due to mismatch of thermal expansion coefficients are identified as the main contribution to the residual stresses. Finally, the theoretical results emphasize that analyses of spectroscopic data acquired for average stress investigations of alumina scales rely on detailed information about microstructural features.
Report Numbers
E 1.99:1286703
Subject(s)
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Note
Published through SciTech Connect.
08/20/2014.
"AA6030000"
"FEAA070"
Surface and Coatings Technology 258 ISSN 0257-8972 AM
Christian Nordhorn; Robert Mücke; Kinga A. Unocic; Michael J. Lance; Bruce A. Pint; Robert Vaßen.
Funding Information
AC05-00OR22725
View MARC record | catkey: 24479859