The Effect of Cutting Speed in Machine Parameters on the Machinability of Inconel 718 Superalloys

Abstract

In this study, Inconel 718; nickel based super alloy, was machined with round uncoated cemented carbide insert on (CNC) JOHNFORD T35 lathe without cutting fluid. Metal cutting processes were carried out by using five different cutting speeds (15, 30, 45, 60, 75 m/min) at constant depth of cut (2 mm) and feed rate (0.20 mm/rev) and the effects of cutting speeds on primary cutting force and surface roughness were discussed. From the experiments, the lowest average primary cutting force was obtained as 629 N at cutting speed of 75 m/min and the highest primary cutting force was obtained as 1150 N at 15 m/min cutting force depending on cutting speed. The lowest average surface roughness has been obtained as cutting speed of 0.45 urn at 45 m/min, and the highest average surface roughness was obtained as 0.88 μm at 75 m/min. Obtained chip form is consecutively narrow and wide stepped.