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Experimental Investigation of Inconel 718 Using Cryogenic Coolant under Varied Nozzle Angle

Inconel 718 is difficult to machine material (DTM) due toits low thermal diffusivity and relatively high hardness. Its use is seen in various applications, which require a higher surface finish (Ra). An enormous volume of heat is produced during machining due to friction at the cutting zone. This affects the tool life and surface ground of the machined surface. Another influential parameter that affects the Ra of the workpiece is the nozzle angle. The use of cutting fluid has a serious effect on the worker’s health and environment. An attempt has been made to assay the effect of nozzle angle on the surface of Inconel 718. For this purpose, the surface of Inconel samples has been machined with cryogenic Liquid carbon dioxide (LCO2) coolant in three different nozzle angles (30˚, 45˚, 60˚). The result showed the possibility of implementing the nozzle angle at 45˚ to improve surface integrity and reduce tool wear.