Effect of thermal barrier coating on low cycle fatigue behavior of cast Inconel 713LC at 900 °C

0435378 - ÚFM 2015 RIV CH eng C - Conference Paper (international conference)
Obrtlík, Karel - Hutařová, S. - Čelko, L. - Juliš, M. - Podrábský, T. - Šulák, Ivo
Effect of thermal barrier coating on low cycle fatigue behavior of cast Inconel 713LC at 900 °C.
11th International Fatigue Congress. Zurich: Trans Tech Publications, 2014 - (Clark, G.; Wang, C.), s. 848-853. Advanced Materials Research, 891-892. ISBN 978-3-03835-008-8. ISSN 1022-6680.
[Fatigue 2014 - International Fatigue Congress /11./. Melbourne (AU), 02.03.2014-07.03.2014]
R&D Projects: GA ČR(CZ) GAP107/11/2065; GA MPO FR-TI4/030
Institutional support: RVO:68081723
Keywords : High temperature fatigue * TBC * Inconel 713LC * Fatigue life
Subject RIV: JL - Materials Fatigue, Friction Mechanics

The effect of thermal barrier coating (TBC) on low cycle fatigue behavior of cast superalloy Inconel 713 LC has been studied at 900 °C. The TBC consisting of a CoNiCrAlY bond coat and a zirconia (ZrO2) top coat stabilized by 8% yttria (Y2O3) was deposited on the gauge section of cylindrical specimens using the atmospheric plasma spray technique. Cylindrical specimens of Inconel 713LC in as-received condition and with surface treatment were cyclically strained under strain control with constant total strain amplitude in symmetrical cycle at 900 °C in air. Hardening/softening curves, cyclic stress-strain curve and fatigue life data of coated and uncoated material were obtained. The stress response of the TBC coated specimens is lower in comparison with the uncoated specimens. Detrimental effect of surface treatment on the Basquin curve is documented. Specimen sectioning and fracture surface observations revealed fatigue damage mechanisms and help to discuss differences in fatigue behavior of the coated and uncoated superalloy.
Permanent Link: http://hdl.handle.net/11104/0239281