Abstract No.:

Fatigue performance of TBC on structural steel exposed to cyclic bending

Radek Musalek* / Czech Academy of Sciences, Czech Republic
Ondrej Kovarik/ Czech Technical University in Prague, Czech Republic
Jan Medricky/ Institute of Plasma Physics AS CR, v.v.i., Czech Republic
Nicholas Curry/ University West, Sweden
Stefan Bjorklund/ University West, Sweden
Per Nylen/ University West, Sweden

Fatigue performance of coated parts is of utmost importance for applications with variable loading. In this study, fatigue performance of bodies coated with thermal barrier coatings (TBCs) deposited on conventional low-cost steel and Ni-based superalloy Hastelloy-X was evaluated in cyclic bending mode by "SF-Test" device. Testing was carried out for as-received and grit-blasted substrates, as well as for samples with Ni-based bond coat and bond-coat with YSZ-based topcoat. Comparison of results obtained for different loading amplitudes supplemented by fractographic analysis enabled identification of dominating failure mechanisms and evaluation of fatigue resistance alteration due to the deposited coatings.

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