The nickel-based superalloy Inconel 718 is used in aerospace, marine, and defense applications due to its unique qualities. However, these alloys are challenging to cut because of their reduced heat conductivity and propensity for work-hardening. With a focus on sustainability, ongoing efforts are being made to increase the machinability of these alloys. This work investigates the shear angle (ɸ_n) and chip thickness ratio (r) during the turning of Inconel 718 using nanofluid under minimum quantity lubrication (NFMQL) varying cutting speed, feed (f), and depth of cut (d). Aluminum oxide (Al₂O₃) nanoparticles were combined with a 0.25% concentration of commercially available palm oil to create a nanofluid. This study found the closely coiled, serrated continuous chips at higher speeds. The r and ɸ_n increased with the cutting speed and decreased with the increase in f and d. The d followed by cutting speed and f, was the most critical parameter for the r and ɸ_n. This study finds further scope for developing the cutting force model based on the r and ɸ_n developed models during the oblique turning of Inconel 718 under NFMQL conditions.

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