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High-temperature low-cycle fatigue and fatigue–creep behaviour of Inconel 718 superalloy: Damage and deformation mechanisms
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SYSNO ASEP 0586291 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title High-temperature low-cycle fatigue and fatigue–creep behaviour of Inconel 718 superalloy: Damage and deformation mechanisms Author(s) Bartošák, M. (CZ)
Horváth, J. (CZ)
Gálíková, Markéta (UFM-A)
Slaný, M. (CZ)
Šulák, Ivo (UFM-A) ORCIDNumber of authors 5 Article number 108369 Source Title International Journal of Fatigue. - : Elsevier - ISSN 0142-1123
Roč. 186, SEP (2024)Number of pages 17 s. Language eng - English Country GB - United Kingdom Keywords Low-cycle fatigue ; Fatigue–creep ; Inconel 718 superalloy ; Damage mechanisms ; Microstructure Subject RIV JG - Metallurgy OECD category Materials engineering R&D Projects EH22_008/0004634 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UFM-A - RVO:68081723 UT WOS 001249227100001 EID SCOPUS 85194333802 DOI https://doi.org/10.1016/j.ijfatigue.2024.108369 Annotation In this article, strain-controlled Low-Cycle Fatigue (LCF) and fatigue–creep tests were performed on Inconel
718 nickel-based superalloy at temperatures of 650 ◦C and 730 ◦C. LCF tests at elevated temperatures were
performed with a mechanical strain rate of 1 × 10−3/s, while fatigue–creep tests involved either tensile or
compressive strain dwell. Both the LCF and fatigue–creep tests revealed cyclic softening, with the mean stress
evolving oppositely to the applied strain dwell in the fatigue–creep tests. Investigations into the damage
mechanisms identified intergranular cracking as the predominant failure mode. Fatigue–creep loading with
a compressive dwell resulted in multiple crack initiations from transgranular oxide intrusions, along with
multiple creep cavities during loading at 730 ◦C. Deformation features such as persistent slip bands and
deformation nanotwins were observed during cycling at 650 ◦C. In addition, fatigue–creep tests at 730 ◦C
exhibited 𝛿 phase precipitation and a coarsening of strengthening precipitates, contributing to additional
softening that increased over prolonged test durations. Finally, the observed lifetime during LCF tests decreased
with increasing temperatures, and fatigue–creep loading was observed to be more damaging than LCF. On the
other hand, fatigue–creep loading with a tensile strain dwell demonstrated a higher lifetime compared to LCF
at 730 ◦C.Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2025 Electronic address https://www.sciencedirect.com/science/article/pii/S0142112324002275?via%3Dihub
Number of the records: 1