Publication detail

Low cycle fatigue performance of Ni-based superalloy coated with complex thermal barrier coating

ŠULÁK, I. OBRTLÍK, K. ČELKO, L. CHRÁSKA, T. JECH, D. GEJDOŠ, P.

Original Title

Low cycle fatigue performance of Ni-based superalloy coated with complex thermal barrier coating

Type

journal article in Web of Science

Language

English

Original Abstract

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.

Keywords

Inconel 713 LC; thermal barrier coating; high-temperature low cycle fatigue; cyclic stress-strain curve; fatigue life curves; degradation mechanisms

Authors

ŠULÁK, I.; OBRTLÍK, K.; ČELKO, L.; CHRÁSKA, T.; JECH, D.; GEJDOŠ, P.

Released

17. 5. 2018

Publisher

Elsevier Inc.

Location

USA

ISBN

1044-5803

Periodical

MATERIALS CHARACTERIZATION

Number

139

State

United States of America

Pages from

347

Pages to

354

Pages count

8

URL

https://doi.org/10.1016/j.matchar.2018.03.023

BibTex

@article{BUT149134,
  author="Ivo {Šulák} and Karel {Obrtlík} and Ladislav {Čelko} and Tomáš {Chráska} and David {Jech} and Pavel {Gejdoš}",
  title="Low cycle fatigue performance of Ni-based superalloy coated with complex
thermal barrier coating",
  journal="MATERIALS CHARACTERIZATION",
  year="2018",
  number="139",
  pages="347--354",
  doi="10.1016/j.matchar.2018.03.023",
  issn="1044-5803",
  url="https://doi.org/10.1016/j.matchar.2018.03.023"
}