Synergistic effects of ultrasonic vibration and nanofluid-MQL on surface integrity in sustainable machining of Ti-6Al-7Nb alloy

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dc.contributor.authorDuman, Erkin
dc.contributor.authorYapan, Yusuf Furkan
dc.contributor.authorUysal, Alper
dc.date.accessioned2025-10-09T07:14:28Z
dc.date.available2025-10-09T07:14:28Z
dc.date.issued2025
dc.departmentMeslek Yüksekokulu, Gedik Meslek Yüksekokulu, Makine Programı
dc.description.abstractRecent trends in the biomedical industry emphasize improving the surface properties of materials for better biocompatibility. Consequently, various surface modification techniques, including machining, are used on titanium bioimplants. This study investigates the impact of sustainable machining on the surface integrity of the Ti-6Al-7Nb biomedical alloy under various cutting conditions including conventional dry cutting, minimum quantity lubrication (MQL), graphene nanofluid-based MQL (N-MQL), and ultrasonic vibration-assisted machining (UVA), encompassing UVA-DRY, UVA-MQL, and UVA-N-MQL. The focus is to analyze the relationship between machining performance and surface integrity. Machining experiments first evaluated cutting forces, cutting temperatures, and chip morphology. Then, surface roughness, texture, microstructural changes, microhardness, and phase transformation were examined to assess surface integrity. The findings reveal that the UVA-N-MQL significantly reduces cutting forces (by up to 6 % for main cutting force and 10.4 % for thrust force) and cutting temperatures (by up to 29 % compared to dry cutting), while enhancing chip breakability. These outcomes stem from the synergistic interaction between the ultrasonic softening effect induced by high-frequency tool oscillations and the enhanced coolant/lubricant penetration enabled by N-MQL lubrication. Additionally, surface roughness was minimized by up to 57 % with UVA-MQL, resulting in the smoothest surface finish. Microstructure analysis also indicated that dry cutting produced the deepest deformation layer (29.5 µm), while UVA-N-MQL achieved the shallowest affected zone (9.5 µm). Subsurface hardness exhibited a notable increase within a depth range of 60–80 µm, with dry cutting demonstrating the most significant work hardening (a 12 % increase), in contrast to UVA-MQL, which experienced the least. Phase transformation analysis revealed a significant increase in the β phase ratio due to machining, with conventional turning exhibiting higher transformation than UVA machining. The UVA-N-MQL method resulted in 10.4 % less phase transformation compared to conventional dry cutting.
dc.description.sponsorshipYildiz Technical University Scientific Research Projects Coordination Unit ; FBA-2023–5792
dc.identifier.doi10.1016/j.cirpj.2025.09.017
dc.identifier.endpage298
dc.identifier.issn1755-5817
dc.identifier.scopus2-s2.0-105017117767
dc.identifier.scopusqualityN/A
dc.identifier.startpage281
dc.identifier.urihttps://doi.org/10.1016/j.cirpj.2025.09.017
dc.identifier.urihttps://hdl.handle.net/11501/2390
dc.identifier.volume63
dc.identifier.wosWOS:001587426800001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakScopus
dc.indekslendigikaynakWeb of Science
dc.institutionauthorDuman, Erkin
dc.institutionauthorid0000-0001-5842-0436
dc.language.isoen
dc.publisherElsevier Ltd
dc.relation.ispartofCIRP Journal of Manufacturing Science and Technology
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectMicrohardness
dc.subjectMicrostructure Deformation
dc.subjectPhase Transformation
dc.subjectSurface Texture
dc.titleSynergistic effects of ultrasonic vibration and nanofluid-MQL on surface integrity in sustainable machining of Ti-6Al-7Nb alloy
dc.typeArticle

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