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Austenitic stainless steel (304L) is one of the most important engineering materials with wide variety of applications because of its properties such as high hardness, toughness, yield strength, excellent ductility, and superior resistance to corrosion and oxidation. However, their machinability is more difficult as compared to other alloy steels due to low thermal conductivity, high built-up edge (BUE) formation tendency and high deformation hardening. Hence, the aim of this paper is to study the performance of different coated carbide inserts and to find out the optimum parameters while dry machining of SS304 L. The design of experiment was done using design expert, where cutting speed, feed rate, depth of cut and nose radius were taken as input parameters. The output responses were the surface roughness and tool wear. Total nine experiments were performed on CNC lathe machine using coated carbide, uncoated carbide and ceramite inserts. The overall results revealed that the optimum flank wear are found 0.12 mm against a combination of input parameters i.e. cutting speed 75m/min, feed rate 0.05mm/rev, depth of cut 0.25 mm using coated carbide inserts. Similarly, the optimum surface roughness were found 0.4 mm against a combination of input parameters i.e. cutting speed 125m/min, feed rate 0.05mm/rev, depth of cut 0.75mm using a tool uncoated carbide inserts.

Machinability Investigations of Stainless Steel (304 L) using different Inserts