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Interaction of isothermal low cycle fatigue and ageing in an EB-PVD thermal barrier coating system

Bartsch, Marion and Chernova, Liudmila and Dalkilic, Serdar (2008) Interaction of isothermal low cycle fatigue and ageing in an EB-PVD thermal barrier coating system. 32rd International Conference on Advanced Ceramics and Composites, 2008-01-26 - 2008-02-01, Daytona Beach, FL (USA).

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Crack growth behaviour in a thermal barrier coating system has been investigated in isothermal low cycle fatigue (LCF) testing of specimens in as coated condition and after ageing in order to achieve information on interaction between fatigue and ageing. Cracks were initiated in most cases at the interface between the metallic bond coat of the TBC system and the adjacent thermally grown oxide. The observed crack growth was assisted by severe oxidation once the crack reached the nickel-based substrate, generating voluminous oxides. Ageing of specimens before the LCF test changed the crack feature and crack growth rate drastically; pre-aging at 950°C for 250 h in air resulted in crack deviation at the diffusion zone between bond coat and substrate with a significant slow down of the crack propagation into the substrate, while extended pre-aging for 500 h did not cause expressed crack deviation but compared to the as coated condition a deceleration of crack propagation. Microstructural analyses showed that formation of a chain of Cr-rich intermetallic precipitates caused the crack deviation after 250 h pre-ageing, while after 500 h a wide meshed network of precipitates formed, which rather slowed down the crack propagation than causing crack deviation. The obtained results will be discussed with respect to strategies for accelerated testing by separation of ageing and fatigue and set in context to lifetime assessment methods.

Item URL in elib:https://elib.dlr.de/56610/
Document Type:Conference or Workshop Item (Speech)
Title:Interaction of isothermal low cycle fatigue and ageing in an EB-PVD thermal barrier coating system
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Dalkilic, SerdarAnadolu University, TurkeyUNSPECIFIEDUNSPECIFIED
Date:30 January 2008
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords: Low cycle fatigue; Thermal barrier coatings; Failure mechanism
Event Title:32rd International Conference on Advanced Ceramics and Composites
Event Location:Daytona Beach, FL (USA)
Event Type:international Conference
Event Dates:2008-01-26 - 2008-02-01
Organizer:The American Ceramic Society
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Low-Emission Air Traffic (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:05 Dec 2008
Last Modified:27 Apr 2009 15:34

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