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Title: Effects of thermal cycling parameters on residual stresses in alumina scales of CoNiCrAlY and NiCoCrAlY bond coats

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.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [2] ;  [1]
  1. Forschungszentrum Julich GmbH (Germany)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Surface and Coatings Technology
Additional Journal Information:
Journal Volume: 258; Journal ID: ISSN 0257-8972
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; bond coatings; high temperature oxidation; alumina scale; residual stress; modeling
OSTI Identifier:
1286703

Nordhorn, Christian, Mücke, Robert, Unocic, Kinga A., Lance, Michael J., Pint, Bruce A., and Vaßen, Robert. Effects of thermal cycling parameters on residual stresses in alumina scales of CoNiCrAlY and NiCoCrAlY bond coats. United States: N. p., Web. doi:10.1016/j.surfcoat.2014.08.028.
Nordhorn, Christian, Mücke, Robert, Unocic, Kinga A., Lance, Michael J., Pint, Bruce A., & Vaßen, Robert. Effects of thermal cycling parameters on residual stresses in alumina scales of CoNiCrAlY and NiCoCrAlY bond coats. United States. doi:10.1016/j.surfcoat.2014.08.028.
Nordhorn, Christian, Mücke, Robert, Unocic, Kinga A., Lance, Michael J., Pint, Bruce A., and Vaßen, Robert. 2014. "Effects of thermal cycling parameters on residual stresses in alumina scales of CoNiCrAlY and NiCoCrAlY bond coats". United States. doi:10.1016/j.surfcoat.2014.08.028. https://www.osti.gov/servlets/purl/1286703.
@article{osti_1286703,
title = {Effects of thermal cycling parameters on residual stresses in alumina scales of CoNiCrAlY and NiCoCrAlY bond coats},
author = {Nordhorn, Christian and Mücke, Robert and Unocic, Kinga A. and Lance, Michael J. and Pint, Bruce A. and Vaßen, Robert},
abstractNote = {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.},
doi = {10.1016/j.surfcoat.2014.08.028},
journal = {Surface and Coatings Technology},
number = ,
volume = 258,
place = {United States},
year = {2014},
month = {8}
}