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Crack growth in a coated gas turbine superalloy under thermo-mechanical fatigue

✍ Scribed by Arnd Jung; Alexander Schnell

Publisher: Elsevier Science
Year: 2008
Tongue: English
Weight: 505 KB
Volume: 30
Category: Article
ISSN: 0142-1123
DOI: 10.1016/j.ijfatigue.2007.01.040

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✦ Synopsis

The out-of-phase thermo-mechanical fatigue (TMF) behaviour of the single crystal superalloy CMSX-4 was studied in the uncoated and in the low-pressure plasma sprayed (LPPS) coated condition. In addition, growth measurements of in-depth coating cracks were performed. Cyclic hardening of the substrate and superimposed multiple crack initiation/propagation within the coating leads to cyclic softening that consumes a significant portion of TMF lifetime. A three-step crack propagation mode of the coated material is described. Special attention is paid to the role of the inter-diffusion zone, since coating cracks are decelerated in the inter-diffusion zone before penetrating into the substrate.

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