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Fatigue Crack Growth in Bodies with Thermally Sprayed Coating
Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Prague, Czech Republic.
Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Prague, Czech Republic.
Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Prague, Czech Republic..
Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Prague, Czech Republic.
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2016 (English)In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 25, no 1-2, 311-320 p.Article in journal (Refereed) Published
Abstract [en]

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 localization of crack initiation sites and the dynamics of crack propagation are studied. The resonance bending fatigue test was employed to test flat specimens with both sides coated. Hastelloy-X substrates coated with classical thermal barrier coating consisting of yttria stabilized zirconia and NiCoCrAlY layers. The strain distribution on the coating surface was evaluated by the Digital Image Correlation method 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, were identified. The tested coatings strongly influenced the first two phases, and the influence on the crack propagation was less significant. In general, the presented crack detection method can be used as a sensitive nondestructive testing method well suited for coated parts. © 2015 ASM International

Place, publisher, year, edition, pages
2016. Vol. 25, no 1-2, 311-320 p.
Keyword [en]
Coatings, Crack detection, Crack initiation, Crack propagation, Cracks, Failure (mechanical), Fatigue crack propagation, Fatigue of materials, Fatigue testing, Image analysis, Nondestructive examination, Strain measurement, Thermal barrier coatings, Yttria stabilized zirconia, Zirconia, Crack initiation sites, Digital image correlation methods, Digital image correlations, Failure mechanism, Nondestructive testing method, Resonance frequencies, Strain distributions, Thermally sprayed coatings, Sprayed coatings
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-8709DOI: 10.1007/s11666-015-0329-9ISI: 000374268000032Scopus ID: 2-s2.0-84944909749OAI: oai:DiVA.org:hv-8709DiVA: diva2:875476
Available from: 2015-12-01 Created: 2015-11-24 Last updated: 2016-12-16Bibliographically approved

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Nicholas, CurryBjörklund, Stefan
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