Investigation of Machinability Characteristics on Turning of Nimonic 90A Using Al ₂ O ₃ and CNT Nanoparticle in Groundnut Oil 2019-28-0072

Nimonic 90A alloy is a nickel-chromium-cobalt alloy and found as a potential material for turbine blades, discs, forgings, a ring section, and hot-working tools. This paper presents the effect of concentration along with cutting speed and feed rate on F_z: cutting force, Ra: surface roughness and Vba: tool wear with the application of two different nanofluids (NFS) on turning of Nimonic 90A by TiAlN PVD carbide cutting inserts. The nanoparticles suspended in oil taken for present investigation are nAl₂O₃, nCNT, and groundnut oil. The Taguchi L₉ orthogonal array and derringer’s desirability response surface has been employed for parameter design and optimal search. 3D surface plots, factor effect plots, Taguchi S/N, and variance tests are used to study the effect of concentration on the machining performance of Nimonic 90A. The statistical analysis revealed % concentration for nCNT and cutting speed for nAl₂O₃ are found as an influenced parameter on performance characteristics. From the optimization analysis, 0.25% nCNT NFs along with a cutting speed of 40 m/min and 0.17 mm/rev feed rate has proved the better machining performance on the above measures that of nAl₂O₃. Based on optical micrograph analysis, abrasion, adhesion, and edge hammering are found to be lower for nAl₂O₃ than that of nCNT NFs. On examination, the chip morphology, the curl diameter chips are exposed to very small for CNT due to the increase in lubricity and decrease of tool friction on turning of Nimonic 90A.