| BAUFELD, Bernd, Marion BARTSCH, Pavel BROŽ and Martin SCHMÜCKER. Microstructural changes as postmortem temperature indicator in Ni-Co-Cr-Al-Y oxidation protection coatings. Materials Science and Engineering A. Netherland, 2004, vol. 384, 1-2, p. 162-171. ISSN 0921-5093. |
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@article{560509,
author = {Baufeld, Bernd and Bartsch, Marion and Brož, Pavel and Schmücker, Martin},
article_location = {Netherland},
article_number = {1-2},
keywords = {CALPHAD; Microstructure; Ni-Co-Cr-Al-Y; Phase equilibria; Precipitates; Temperature indicator},
language = {eng},
issn = {0921-5093},
journal = {Materials Science and Engineering A},
title = {Microstructural changes as postmortem temperature indicator in Ni-Co-Cr-Al-Y oxidation protection coatings},
volume = {384},
year = {2004}
}
TY - JOUR
ID - 560509
AU - Baufeld, Bernd - Bartsch, Marion - Brož, Pavel - Schmücker, Martin
PY - 2004
TI - Microstructural changes as postmortem temperature indicator in Ni-Co-Cr-Al-Y oxidation protection coatings
JF - Materials Science and Engineering A
VL - 384
IS - 1-2
SP - 162-171
EP - 162-171
SN - 09215093
KW - CALPHAD
KW - Microstructure
KW - Ni-Co-Cr-Al-Y
KW - Phase equilibria
KW - Precipitates
KW - Temperature indicator
N2 - Microstructural changes in a metallic oxidation protection coating (Ni-Co-Cr-Al-Y) applied on a nickel base superalloy were investigated by means of scanning and transmission electron microscopy. The changes are due either to thermal mechanical fatigue testing under high thermal gradients or to defined isothermal heat treatments. The coated specimens were quenched from temperatures between 840 and 1100 C to ambient temperature. The resultant phases, their local distribution and compositions were determined by energy dispersive X-ray (EDX) spectroscopy and electron diffraction. Phase equilibria at respective temperatures were determined by thermodynamic calculations based on the CALPHAD method. The calculated and experimentally determined phase distributions were compared. A particular microstructural feature, namely the existence and spatial distribution of spherical gamma' Ni3Al precipitates in the coating and the diffusion zone between substrate and coating, was used as a postmortem indicator for the maximum temperature experienced by the specimen during testing. This paper gives a road map for developing a microstructural-based temperature calibration for complex metallic materials using thermodynamic simulations.
ER -
BAUFELD, Bernd, Marion BARTSCH, Pavel BROŽ and Martin SCHMÜCKER. Microstructural changes as postmortem temperature indicator in Ni-Co-Cr-Al-Y oxidation protection coatings. \textit{Materials Science and Engineering A}. Netherland, 2004, vol.~384, 1-2, p.~162-171. ISSN~0921-5093.
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