The influence of plasma sprayed multilayers of Cr2O3 and Ni10wt%Al on fatigue resistance

0434792 - ÚFP 2015 RIV CH eng J - Článek v odborném periodiku
Kovářík, O. - Haušild, P. - Siegl, J. - Pala, Zdeněk - Matějíček, Jiří - Davydov, V.
The influence of plasma sprayed multilayers of Cr2O3 and Ni10wt%Al on fatigue resistance.
Surface and Coatings Technology. Roč. 251, July (2014), s. 143-150. ISSN 0257-8972
Grant CEP: GA ČR(CZ) GAP108/12/1872
Institucionální podpora: RVO:61389021
Klíčová slova: Fatigue * Layered coating * Residual stress * Strain hardening * NiAl * Cr2O3
Kód oboru RIV: JK - Koroze a povrchové úpravy materiálů
Impakt faktor: 1.998, rok: 2014
http://www.sciencedirect.com/science/article/pii/S0257897214003326#

The influence of layering sequence of plasma sprayed composite coatings on the fatigue life was studied. Plain, grit-blasted, and plasma sprayed specimens with one to three coating layers were examined. The layered coatings were composed of alternating sequence of ceramic (Cr2O3) and metallic (Ni10wt%Al) deposits. Deflection controlled resonance symmetrical bending fatigue tests of flat specimens were performed. The deformation amplitude was 1.3 millistrain in the crack initiation site and loading frequency was around 80 Hz. The significance of the effect of surface treatment on fatigue properties was examined statistically using Wilcoxon test.From the obtained data,the effect of individual layers was deduced.In order to explain the observed fatigue behavior, the fractographic analysis was performed and the coating–substrate composite was characterized.Strain hardening profile in the substrate was estimated by microhardness measurement and electron back scatter diffraction
Trvalý link: http://hdl.handle.net/11104/0238776