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dc.contributor.authorMadariaga, Aitor
dc.contributor.authorGaray, Ainara
dc.contributor.authorEsnaola, Jon Ander
dc.contributor.authorARRAZOLA, PEDRO JOSE
dc.contributor.otherLinaza, Arantza
dc.date.accessioned2022-06-16T10:41:24Z
dc.date.available2022-06-16T10:41:24Z
dc.date.issued2022
dc.identifier.issn1350-6307en
dc.identifier.otherhttps://katalogoa.mondragon.edu/janium-bin/janium_login_opac.pl?find&ficha_no=167829en
dc.identifier.urihttp://hdl.handle.net/20.500.11984/5607
dc.description.abstractCritical aero-engine components such as turbine discs must withstand severe cyclic stresses, which can eventually lead to low cycle fatigue (LCF) failures. These components are made of difficult-to-cut alloys and machining conditions that are employed in the last stage of the manufacturing chain must be correctly defined to avoid the generation of an adverse surface condition (tensile residual stresses, excessive surface roughness or microstructural defects) that will accelerate fatigue failure. The analysis presented in this paper is aimed at understanding the isothermal LCF behaviour of turned Inconel 718 workpieces and finding quantitative correlations with the surface integrity. For this purpose, two Inconel 718 forged discs were face turned at cutting conditions employed in the aero-engine manufacturing industry using two different tools (1.2 mm and 4 mm nose radius respectively). The surface integrity produced by the face turning process was characterised in both discs: surface topography, residual stresses and surface layer anomalies. Specimens extracted from both discs were tested in load control at 450 ◦C to obtain LCF fatigue behaviour. Importantly, interrupted isothermal LCF fatigue tests were conducted and residual stresses were measured by the X-ray diffraction technique at the surface of the tested specimens to study the role of residual stresses in the LCF fatigue behaviour. For the tested conditions, the specimens machined with 4 mm nose radius showed 1.3–1.4 times longer fatigue lives than the specimens turned with 1.2 mm nose radius. These results are in agreement with the better surface integrity generated with the 4 mm nose radius, mainly because it induced lower tensile residual stresses. A novel local approach was implemented to understand the influence of surface integrity (surface roughness, surface residual stresses and altered stress-strain properties of the surface layer) on the isothermal LCF fatigue behaviour of both machined discs. Interestingly, a satisfactory correlation was found between the maximum applied stress in the surface layer and the isothermal LCF fatigue life employing the local approach.en
dc.description.sponsorshipGobierno Vascoes
dc.language.isoengen
dc.publisherElsevier Ltd.en
dc.subjectFatigueen
dc.subjectSurface Integrityen
dc.subjectX-ray analysisen
dc.subjectNickel alloyen
dc.subjectMachiningen
dc.titleEffect of surface integrity generated by machining on isothermal low cycle fatigue performance of Inconel 718en
dc.typeinfo:eu-repo/semantics/articleen
dcterms.accessRightsinfo:eu-repo/semantics/embargoedAccessen
dcterms.sourceEngineering Failure Analysisen
dc.description.versioninfo:eu-repo/semantics/acceptedVersionen
local.contributor.groupMecanizado de alto rendimientoes
local.description.peerreviewedtrueen
local.identifier.doihttps://doi.org/10.1016/j.engfailanal.2022.106422en
local.relation.projectIDinfo:eu-repo/grantAgreement/GV/Elkartek 2019/KK-2019-00077/CAPV/Superficies multifuncionales en la frontera del conocimiento/FRONTIERS Ven
local.embargo.enddate2024-07-31
local.contributor.otherinstitutionITP Aeroes
local.source.details.Vol. 137. N. artículo 106422, 2022en


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