High-temperature low-cycle fatigue and fatigue-creep behaviour of Inconel 718 superalloy: Damage and deformation mechanisms

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dc.contributor.authorBartošák, Michalcs
dc.contributor.authorHorváth, Jakubcs
dc.contributor.authorGálíková, Markétacs
dc.contributor.authorSlaný, Michalcs
dc.contributor.authorŠulák, Ivocs
dc.coverage.issue9cs
dc.coverage.volume186cs
dc.date.accessioned2025-03-28T06:44:16Z
dc.date.available2025-03-28T06:44:16Z
dc.date.issued2024-09-01cs
dc.description.abstractIn this article, strain -controlled Low -Cycle Fatigue (LCF) and fatigue-creep tests were performed on Inconel 718 nickel -based superalloy at temperatures of 650 degrees C and 730 degrees C. LCF tests at elevated temperatures were performed with a mechanical strain rate of 1 x 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 degrees C. Deformation features such as persistent slip bands and deformation nanotwins were observed during cycling at 650 degrees C. In addition, fatigue-creep tests at 730 degrees C exhibited 8 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 degrees C.en
dc.formattextcs
dc.format.extent1-17cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationINTERNATIONAL JOURNAL OF FATIGUE. 2024, vol. 186, issue 9, p. 1-17.en
dc.identifier.doi10.1016/j.ijfatigue.2024.108369cs
dc.identifier.issn1879-3452cs
dc.identifier.orcid0009-0000-8410-9107cs
dc.identifier.other189988cs
dc.identifier.researcheridKDM-8675-2024cs
dc.identifier.scopus58881912200cs
dc.identifier.urihttps://hdl.handle.net/11012/250684
dc.language.isoencs
dc.publisherElseviercs
dc.relation.ispartofINTERNATIONAL JOURNAL OF FATIGUEcs
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S0142112324002275cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1879-3452/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectLow-cycle fatigueen
dc.subjectFatigue-creepen
dc.subjectInconel 718 superalloyen
dc.subjectDamage mechanismsen
dc.subjectMicrostructureen
dc.titleHigh-temperature low-cycle fatigue and fatigue-creep behaviour of Inconel 718 superalloy: Damage and deformation mechanismsen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
eprints.grantNumberinfo:eu-repo/grantAgreement/MSM/EH/EH22_008/0004634cs
sync.item.dbidVAV-189988en
sync.item.dbtypeVAVen
sync.item.insts2025.03.28 07:44:16en
sync.item.modts2025.03.28 07:32:31en
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Středoevropský technologický institut VUTcs
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