Fatigue crack growth in bodies with thermally sprayed coating
2015 (English)In: Proceedings of the International Thermal Spray Conference, 2015, Vol. 1, 398-405 p.Conference paper (Refereed)Text
Many applications of thermally sprayed coatings call for increased fatigue resistance of coated parts. Despite the intensive research in this area, the influence of coating on fatigue is still not completely understood. In this paper, the spatiotemporal localization of crack initiation and the dynamics of crack propagation are studied. The resonance bending fatigue test is employed to test flat specimens with both sides coated. Hastelloy-X substrates coated with classical TBC YSZ/NiCoCrAlY composites were tested. The strain distribution on the coating surface is evaluated by the digital image correlation method (DIC) through the whole duration of the fatigue test. Localization of crack initiation sites and the mode of crack propagation in the coated specimen are related to the observed resonance frequency. The individual phases of specimen degradation, i.e. the changes of material properties, crack initiation, and crack propagation are identified. The tested coatings strongly influenced the first two phases, the influence on the crack propagation was less significant. Â© Copyright (2015) by ASM International All rights reserved.
Place, publisher, year, edition, pages
2015. Vol. 1, 398-405 p.
Coatings; Crack initiation; Crack propagation; Cracks; Fatigue crack propagation; Fatigue testing, Coating surface; Crack initiation sites; Digital image correlation methods; Intensive research; Resonance bending; Resonance frequencies; Strain distributions; Thermally sprayed coatings, Sprayed coatings
Manufacturing, Surface and Joining Technology
Research subject ENGINEERING, Manufacturing and materials engineering
IdentifiersURN: urn:nbn:se:hv:diva-9328ScopusID: 2-s2.0-84962917609OAI: oai:DiVA.org:hv-9328DiVA: diva2:923827
International Thermal Spray Conference and Exposition, ITSC 2015; Long Beach; United States; 11 May 2015 through 14 May 2015
Conference Code:1196672016-04-272016-04-272016-04-27Bibliographically approved