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Low cycle fatigue performance of Ni-based superalloy coated with complex thermal barrier coating
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SYSNO ASEP 0491914 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Low cycle fatigue performance of Ni-based superalloy coated with complex thermal barrier coating Author(s) Šulák, Ivo (UFM-A) ORCID
Obrtlík, Karel (UFM-A) RID, ORCID
Čelko, L. (CZ)
Chráska, Tomáš (UFP-V) RID, ORCID
Jech, D. (CZ)
Gejdoš, P. (CZ)Number of authors 6 Source Title Materials Characterization. - : Elsevier - ISSN 1044-5803
Roč. 139, MAY (2018), s. 347-354Number of pages 8 s. Language eng - English Country US - United States Keywords Inconel 713LC ; Thermal barrier coating ; High-temperature low cycle fatigue ; Cyclic stress-strain curve ; Fatigue live curves ; Degradation mechanisms Subject RIV JL - Materials Fatigue, Friction Mechanics OECD category Audio engineering, reliability analysis Subject RIV - cooperation Institute of Plasma Physics - Materials Fatigue, Friction Mechanics R&D Projects GA15-20991S GA ČR - Czech Science Foundation (CSF) Institutional support UFM-A - RVO:68081723 ; UFP-V - RVO:61389021 UT WOS 000431469300037 EID SCOPUS 85044127093 DOI 10.1016/j.matchar.2018.03.023 Annotation Thermal barrier coatings (TBCs) are widely applied to protect high-temperature components against high temperatures in harsh environments. Nineteen cylindrical specimens of Inconel 713LC were manufactured using the investment castings technique, and 10 specimens were subsequently coated with a novel complex thermal barrier coating (TBC) system. The TBC system comprises a metallic CoNiCrAlY bond coat (BC) and a complex ceramic top coat (TC). The TC is a mixture of a near eutectic nanocrystalline ceramic made of zirconia (ZrO2), alumina (Al2O3), silica (SiO2) and conventional yttria stabilized zirconia (YSZ) ceramic in the ratio of 50/50 in wt%. Low cycle fatigue (LCF) tests were carried out in a symmetrical push-pull cycle under strain control at 900 °C. Cyclic hardening/softening curves, cyclic stress-strain curves and fatigue life curves of the TBC-coated and uncoated material were assessed. Fatigue life curves in total strain representation showed transient behaviour. Fracture surfaces and polished sections parallel to the loading axis of the TBC-coated and uncoated specimens prior and after cyclic loading were observed by means of scanning electron microscopy (SEM) to study the degradation mechanisms during high-temperature LCF. TBC delamination was observed at the TC/BC interface, and rafting of precipitates occurred after high-temperature exposure. The microstructural investigations further the discussion of the differences in the stress-strain response and the fatigue life of the TBC-coated and uncoated superalloy. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2019
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