Abstract
Nimonic C-263 is one of most important grades of nickel-based superalloys particularly used in hot section of gas turbines, aerospace, power generators and heat exchangers. It belongs to the class of difficult-to-cut materials because of its unique properties such as high hardness, fatigue strength, low thermal conductivity, high chemical affinity and tensile strength along with resistance to corrosion and oxidation. Machinability can be improved with proper selection of cutting tool and cutting parameters. The present paper deals with comparative analysis of tool wear and chip characteristics when machining Nimonic C-263 with uncoated and multilayer coated carbide inserts. Dry turning operation was carried out at two different cutting speeds (Vc) of 51 m/min and 84 m/min with a constant feed (f) of 0.2 mm/rev and depth of cut (ap) of 1 mm. Chip reduction coefficient (ζ), tool wear, surface roughness and cutting temperature were observed during dry machining of Nimonic C-263. While surface finish could not be improved, remarkable reduction in cutting temperature, chip reduction co-efficient and tool wear was noted for the multi-layer coated insert under different cutting condition.
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