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Article Dans Une Revue International Journal of Damage Mechanics Année : 2006

Influence of Coating on the Thermal Fatigue Resistance of a Ni-based Superalloy

Résumé

In this article, the influence of a 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 thermomechanical 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 show a deleterious effect of the coating on the fatigue resistance. Numerical simulations have been carried out on SAMCEF to determine the thermomechanical field of the so-tested specimens. Calculated thermomechanical cycles of critical sites are associated with micro-structure evolution and damage by cracking observed on the specimens. Damage mechanisms related to the presence of the coating are discussed.
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Dates et versions

hal-00571149 , version 1 (01-03-2011)

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Catherine Mabru, N. Stephan, Rémy Chieragatti. Influence of Coating on the Thermal Fatigue Resistance of a Ni-based Superalloy. International Journal of Damage Mechanics, 2006, 15 (4), pp.375-391. ⟨10.1177/1056789506058049⟩. ⟨hal-00571149⟩

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