Investigation of machinability characteristics and chip morphology on Inconel 718: Dry and MQL 2019-28-0066
Nickel based superalloys Inconel 718 has a unique property. It contains oxidation corrosion resistant materials. This property makes it highly suitable for extreme environments subjected to pressure and heat. In the present study, dry and MQL(Minimum Quantity Lubrication) experiments are carried out on Inconel 718 alloy based on designed L16 orthogonal array using the advanced coated cutting tool and uncoated tool, respectively. The levels of turning parameters are varied at 70, 120, 170 and 220 m/min of turning speed, 0.1, 0.15, 0.2 and 0.25 mm/rev of feed rate and 0.3, 0.4, 0.5 and 0.6 mm of cutting depth. The cutting forces, surface roughness, flank wear, and chip morphology are taken for current investigation. The factor effect on output responses is studied using responses surface 3D and 1D plots. At the comparative analysis, the decrement in surface roughness value by 3.59%, increment in cutting force by 29.14% and increment in wear by 71.07% is observed in MQL turning with the uncoated tool as compare to dry turning with the coated tool. At the optimum level, improvement in the tool life by 30.2% in terms of machining length and reduction in cost by 34.33% is observed in case of MQLwith uncoated tool when compared to dry machining with the coated tool.