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Application of image analysis and image simulation for quantitative characterization of scale spallation during cyclic oxidation of a Pt-aluminide coating

Lacaze, Jacques and Lupker, Maarten and Vialas, Nadia and Monceau, Daniel Application of image analysis and image simulation for quantitative characterization of scale spallation during cyclic oxidation of a Pt-aluminide coating. (2006) Intermetallics, vol. 14 (n° 4 ). pp. 423-434. ISSN 0966-9795

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Official URL: http://dx.doi.org/10.1016/j.intermet.2005.08.007

Abstract

An image analysis and simulation of the spalled alumina areas at the surface of a Pt modified b-NiAl aluminide coating RT22 during cyclic oxidation in air is presented. The size distribution of the freshly spalled areas and of the unspalled zones is studied for the same coating deposited on three different nickel base superalloys which were exposed to various numbers of 300 h cycles at 1050 8C (up to 10,500 h) in a previous study [Vialas N, Monceau D. Oxid Metals, submitted for publication]. It is shown for this coating that the distribution of the freshly spalled area depends on the nature of the coated substrate and on the number of cycles. It is also shown that spallation of these three systems can be simulated by a twoparameter model which describes the spalling during the cooling step as successive microspalling events through nucleation and growth processes. This approach is consistent with previous in-situ observations and allows the introduction of a time-dependent damaging process in the models of cyclic oxidation kinetics.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Intermetallics website : http://www.sciencedirect.com/science/journal/09669795
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Celine Cabaup
Deposited On:20 May 2009 08:56

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