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International Journal of Damage Mechanics
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Influence of Coating on the Thermal Fatigue Resistance of a Ni-based Superalloy

C. Mabru

Département Génie Mécanique Ecole Nationale Supérieure d’Ingénieurs de Constructions Aéronautiques 1 Place Emile Blouin 31056 Toulouse Cedex 5, France, cmabru{at}ensica.fr

N. Stephan

Département Génie Mécanique Ecole Nationale Supérieure d’Ingénieurs de Constructions Aéronautiques 1 Place Emile Blouin 31056 Toulouse Cedex 5, France

R. Chieragatti

Département Génie Mécanique Ecole Nationale Supérieure d’Ingénieurs de Constructions Aéronautiques 1 Place Emile Blouin 31056 Toulouse Cedex 5, France

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.

Key Words: thermomechanical fatigue • coating • Ni-base superalloy

International Journal of Damage Mechanics, Vol. 15, No. 4, 375-391 (2006)
DOI: 10.1177/1056789506058049
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