Residual stress and microstructure of CoNiCrAlY coated superalloys upon thermo-mechanical fatigue
Overlay coatings are being increasingly used in aeronautical industry to improve oxidation resistance of superalloy based structural components in high-temperature applications (eg buffer layers in thermal barrier coatings). To understand the behaviour of these materials one needs to identify the mechanisms of damage that lead to failure in the temperature range of interest. To accomplish this a systematic study was initiated on the thermo-mechanical fatigue (TMF) behaviour of CoNiCrAlY coated SRR-99 superalloy. The large temperature variations that occur in service induce residual stresses between the two materials. They originate at the interface region and extend up to the surface of the coating and also into the substrate affecting their TMF behaviour. The characterization of the residual stress state upon TMF is the main objective of this paper.
Bibliographic Reference: Paper presented: EPDIC-6, Budapest (HU); August 22-25, 1998
Availability: Available from (1) as Paper EN 41770 ORA
Record Number: 199811387 / Last updated on: 1998-11-10
Original language: en
Available languages: en