Abstract
This paper describes the machinability characteristics of turning Hastelloy C-276 with PVD coated nano-multilayer TiAlN cutting tool using dry turning and liquid nitrogen cooling methods. The turning operations were performed at a constant feed rate (0.111 mm/rev); depth of cut (1 mm) and three different cutting velocities (0.72, 1.17 and 1.97 m/s). The effects of liquid nitrogen cooling on cutting zone temperature, force components (Fz & Fx), roughness parameters (Ra, Rz & Rt), chip morphology and tool wear have been compared with those of dry turning. Turning of Hastelloy C-276 with liquid nitrogen cooling, reduction in cutting zone temperature by about 61–68%, the decrease in cutting force components by about 8–33%, and reduction in surface roughness parameters by 8–33% over dry turning were observed. Cryogenic cooling provided reduced serrated tooth formation for chips which was more than what was observed in dry turning. Improvement of cutting tool performance was achieved under liquid nitrogen cooling by control of wear mechanisms which, in turn, reduced the wear rate. The experimental results indicated the provisions of better performance than dry cutting by the machinability characteristics of Hastelloy C-276 under cryogenic cooling.
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