OBRABOTKAMETALLOV Vol. 28 No. 1 2026 173 EQUIPMENT. INSTRUMENTS Turning Inconel 718 with a self-propelled rotary tool using a hybrid nanofl uid under minimum quantity lubrication Satish Chinchanikar 1, a, *, Nitin Motgi 2, 3, b 1 Department of Mechanical Engineering, Vishwakarma Institute of Technology, Affi liated to Savitribai Phule Pune University, Pune – 411037, India 2 Department of Mechanical Engineering, Vishwakarma Institute of Information Technology, Affi liated to Savitribai Phule Pune University, Pune – 411048, India 3 Department of Mechanical Engineering, D.Y. Patil International University, Akurdi, Pune, Maharashtra, 411044, India a https://orcid.org/0000-0002-4175-3098, satish.chinchanikar@vit.edu; b https://orcid.org/0000-0001-9062-8341, nitin.221p0031@viit.ac.in Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2026 vol. 28 no. 1 pp. 152–175 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2026-28.1-152-175 ART I CLE I NFO Article history: Received: 05 November 2025 Revised: 22 November 2025 Accepted: 17 December 2025 Available online: 15 March 2026 Keywords: Turning Inconel 718 MQL Rotary tool Nanofl uid ABSTRACT Introduction. Superalloys like nickel ones are crucial in aircraft construction, rocket production, and, more broadly, in the aviation industry due to their hard-wearing, and high-strength properties, but high machining temperatures pose challenges to their machinability. Manufacturers are always looking for new ways to improve these materials’ machinability using cutting-edge cutting tool technologies and suitable cooling methods. In this context, rotary tools have shown signifi cant potential for better performance in machining challenging materials. The purpose of the work. It is essential to comprehend geometric dimensioning and tolerance (GD&T) parameters when machining aerospace alloys to ensure precision and interchangeability in parts manufacturing. However, limited studies have investigated these parameters while considering the eff ect of nanofl uids during turning with rotary tools. Methods of investigation. This study explores the turning of Inconel 718 with a hybrid nanofl uid under minimum quantity lubrication (NFMQL) conditions using a self-propelled rotary tool (SPRT). Nanofl uids were prepared by mixing Al₂O₃ and multi-walled carbon nanotubes in palm oil. The analysis of worn tools was performed through optical and SEM images. Further, the radial GD&T parameters, such as circularity, cylindricity, radial runout, surface roughness, tool life, and workpiece hardness, are discussed as they vary with the cutting conditions. Additionally, the technique for order of preference by similarity to the ideal solution (TOPSIS) in association with a genetic algorithm (GA) was used to generate Pareto solutions and select the optimal compromise solution. The work with the optimized parameters is fi nally summarized. Results and Discussion. A hybrid nanofl uid under NFMQL conditions was used to assess the processability of Inconel 718 during turning with an SPRT. The circularity, cylindricity, radial runout, and machined surface characteristics were investigated. The worn tools have been examined through optical and scanning electron microscopy images. Surface roughness and tool life are signifi cantly aff ected by feed and cutting speed, while cylindricity is strongly impacted by the depth of cut. Pareto fronts and the best compromise solutions were obtained using a genetic algorithm integrated with TOPSIS. This study found that turning Inconel 718 at a feed rate and depth of cut of 0.1 mm/rev and 0.2 mm, respectively, and a cutting speed between 30–60 m/min could achieve circularity and cylindricity deviations of up to 5.68 μm and radial runout of up to 0.43mm, as well as surface roughness, tool life, andworkpiece hardness in the ranges of 1.07–1.54 μm, 3.46–8.44 min, and 36–38 HRC, respectively. This research provides valuable insights for designing an SPRT and promoting its wide adoption and application in the machining domain for machining superalloys. This study suggests exploring nanoparticle agglomeration in nanofl uids and the use of additives to improve machining effi ciency. Additionally, this research identifi es opportunities to enhance machining performance under NFMQL conditions by utilizing microtextured SPRTs with nanofl uids, addressing concerns related to machined surface integrity. For citation: Chinchanikar S., Motgi N. Turning Inconel 718 with a self-propelled rotary tool using a hybrid nanofl uid under minimum quantity lubrication. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2026, vol. 28, no. 1, pp. 152–175. DOI: 10.17212/1994-6309-2026-28.1-152-175. (In Russian). ______ * Corresponding author Satish Chinchanikar, Ph.D. (Engineering), Professor Department of Mechanical Engineering, Vishwakarma Institute of Information Technology, Affi liated to Savitribai Phule Pune University, Pune – 411048, India Tel.: 91-2026950401, e-mail: satish.chinchanikar@vit.edu
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