Publication detail
Degradation of TBC Coating during Low-cycle Fatigue Tests at High Temperature
HUTAŘOVÁ, S. OBRTLÍK, K. JULIŠ, M. ČELKO, L. JULIŠOVÁ, M. PODRÁBSKÝ, T.
Czech title
Degradace TBC povlaků během nízkocyklové únavové zkoušky při vysoké teplotě
English title
Degradation of TBC Coating during Low-cycle Fatigue Tests at High Temperature
Type
conference paper
Language
en
Original abstract
The work is focused on the study of degradation of ZrO2 stabilized by Y2O3 (YSZ) thermal-barrier-coating system with CoNiCrAlY bond coat applied on cast polycrystalline nickelbased superalloy Inconel 713LC. Cylindrical specimens in as-coated conditions were cyclically strained under strain control with constant total strain amplitude in symmetrical cycle at high temperature (900 oC) in air. Coating system YSZ with CoNiCrAlY bond coat were prepared by APS method on blasted surface. The microstructure of TBC was characterized with scanning electron microscopy and energy dispersion X-ray analysis. The coating thickness and hardness profile was measured. Fracture surface, surface relief and polished sections parallel to the specimen axis were examined to study damage mechanisms in coatings under cyclic loading at high temperature. It was find that initiation of the fatigue crack usually occurs on interface YSZ-CoNiCrAlY and the trajectory of the further crack propagation was documented.
Czech abstract
Práce je zaměřena na studium degradace ZrO2 stabilizovaného Y2O3 (YSZ) tepelně-bezbariérový nátěrový systém s CoNiCrAlY vaznou vrstvu aplikovat na lité polykrystalické nickelbased superalloy Inconel 713LC. Válcové vzorky v as-potažených podmínky byly cyklicky napjaté pod kontrolou kmene s konstantní celkové kmenem amplitudou v symetrickém cyklu na vysoké teplota (900 ° C) ve vzduchu. Nátěrový systém YSZ s CoNiCrAlY dluhopisů srstí byly připraveny APS metoda na otryskaném povrchu. Mikrostruktura TBC byl charakterizován pomocí skenovacího elektronového mikroskopie a energie disperzní analýza X-ray. Profil tloušťka vrstvy a tvrdost byla měřeno. Fracture povrch, povrchový reliéf a leštěné řezy rovnoběžné s osou vzory byly zkoumal studovat mechanismy poškození povlaků při cyklickém zatěžování při vysoké teplotě. Bylo zjistíte, že zahájení únavové trhliny se obvykle vyskytuje na rozhraní YSZ-CoNiCrAlY a trajektorie dalšího šíření trhliny byla dokumentována.
English abstract
The work is focused on the study of degradation of ZrO2 stabilized by Y2O3 (YSZ) thermal-barrier-coating system with CoNiCrAlY bond coat applied on cast polycrystalline nickelbased superalloy Inconel 713LC. Cylindrical specimens in as-coated conditions were cyclically strained under strain control with constant total strain amplitude in symmetrical cycle at high temperature (900 oC) in air. Coating system YSZ with CoNiCrAlY bond coat were prepared by APS method on blasted surface. The microstructure of TBC was characterized with scanning electron microscopy and energy dispersion X-ray analysis. The coating thickness and hardness profile was measured. Fracture surface, surface relief and polished sections parallel to the specimen axis were examined to study damage mechanisms in coatings under cyclic loading at high temperature. It was find that initiation of the fatigue crack usually occurs on interface YSZ-CoNiCrAlY and the trajectory of the further crack propagation was documented.
Keywords in Czech
Únava za vysokých teplot; YSZ; CoNiCrAlY; Inconel 713LC; iniciace trhlin; šíření trhlin
Keywords in English
High temperature fatigue; YSZ; CoNiCrAlY; Inconel 713LC; crack initiation; crack propagation
RIV year
2014
Released
01.04.2014
Publisher
Trans Tech Publications Ltd
Location
Zurich-Durnten, Switzerland
ISBN
9783037859346
ISSN
1013-9826
Book
Key Engineering Materials
Volume
2014
Number
592-593
Pages from–to
461–464
Pages count
4
BIBTEX
@inproceedings{BUT105746,
author="Simona {Hutařová} and Karel {Obrtlík} and Martin {Juliš} and Ladislav {Čelko} and Martina {Julišová} and Tomáš {Podrábský},
title="Degradation of TBC Coating during Low-cycle Fatigue Tests at High Temperature",
booktitle="Key Engineering Materials",
year="2014",
volume="2014",
number="592-593",
month="April",
pages="461--464",
publisher="Trans Tech Publications Ltd",
address="Zurich-Durnten, Switzerland",
isbn="9783037859346",
issn="1013-9826"
}