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Influence of coating on the thermal resistance of a Ni-Based superalloy

Mabru, Catherine and Stephan, Nicolas and Chieragatti, Rémy Influence of coating on the thermal resistance of a Ni-Based superalloy. (2006) International Journal of Damage Mechanics, vol. 1 (n° 4). pp. 375-391. ISSN 1056-7895

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Official URL: http://dx.doi.org/10.1177/1056789506058049

Abstract

In this paper, the influence of M-CrAlY polycrystalline coating on the thermal fatigue behavior of a Nickel-base superalloy has been investigated. A special device using a rotating bending machine and two thermal sources has been used to perform thermo-mechanical tests. The two thermal sources have been set to obtain temperature variations between 750 and 1120 °C in the central part of the specimens, with a frequency of 0.1 Hz. The results showed a deleterious effect of the coating on the fatigue resistance. Numerical simulations have been carried out on SAMCEF to determine the thermo-mechanical field of the so-tested specimens. Calculated thermo-mechanical cycles of critical sites are associated with microstructure evolution and damage by cracking observed on the specimens. Damage mechanisms related to the presence of coating are discussed.

Item Type:Article
Audience (journal):International peer-reviewed journal
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Institution: Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE
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Deposited By:Catherine Mabru

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