Prediction of white layer formation in ?-WEDM process of NiTi shape memory superalloy: FEM with experimental verification

Basit Öğe Kaydı
dc.contributor.authorIlkhchi, Reza Najati
dc.contributor.authorAkar, Samet
dc.contributor.authorMeshri, Hassan Ali M.
dc.contributor.authorSeyedzavvar, Mirsadegh
dc.date.accessioned2025-01-06T17:29:59Z
dc.date.available2025-01-06T17:29:59Z
dc.date.issued2021
dc.description.abstractMicroscopic changes in the surface of nickel-titanium (nitinol) shape memory alloys (SMAs) in micro-wire electro-discharge machining (?-WEDM) due to the formation of a resolidified layer on the machined surface, called white layer, are one of the main drawbacks in the processing of such alloys. Since these changes significantly affect the shape memory and elastic recovery characteristics of these alloys, reduction of the white layer thickness (WLT) based on the selection of optimum process parameters is essential to raise the quality of the machined parts. In this regard, a finite element model (FEM) has been developed to simulate the effects of ?-WEDM process parameters, including discharge current, pulse on-time, pulse off-time, and servo voltage, on the heat distributing in Ni55.8Ti SMA to predict the WLT. The flushing efficiency of electric discharges and the effect of flow regime of the dielectric fluid on the heat distribution in the workpiece and the formation of the WLT are analyzed. Experimental data are used to verify the accuracy of the FEM. The results show that the developed model can predict the WLT in ?-WEDM process of Ni55.8Ti SMA with an average error of 14%. The effects of discharge parameters on the formation of the WLT are discussed in details based on the results of the FEM. © 2021, The Author(s), under exclusive licence to Springer-Verlag London Ltd. part of Springer Nature.
dc.description.sponsorshipBilkent Üniversitesi
dc.identifier.doi10.1007/s00170-021-06796-y
dc.identifier.endpage2817
dc.identifier.issn0268-3768
dc.identifier.issue9-10
dc.identifier.scopus2-s2.0-85101775627
dc.identifier.scopusqualityQ1
dc.identifier.startpage2805
dc.identifier.urihttps://doi.org/10.1007/s00170-021-06796-y
dc.identifier.urihttps://hdl.handle.net/20.500.14669/1436
dc.identifier.volume113
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherSpringer Science and Business Media Deutschland GmbH
dc.relation.ispartofInternational Journal of Advanced Manufacturing Technology
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241211
dc.subjectElectric discharge
dc.subjectFEM
dc.subjectMolten crater
dc.subjectNi<sub>55.8</sub>Ti SMA
dc.subjectWhite layer thickness
dc.subject?-WEDM
dc.titlePrediction of white layer formation in ?-WEDM process of NiTi shape memory superalloy: FEM with experimental verification
dc.typeArticle

Dosyalar

Koleksiyon

Scopus İndeksli Yayınlar Koleksiyonu