Effect of cryogenic and wet coolant performance on drilling of super duplex stainless steel (2507)

Abstract

In this experimental study, the cutting performance of solid carbide twist drill with wet and cryogenic cooling (LN2) was analysed for super duplex stainless steel 2507 (SDSS 2507). The drilling test was conducted at three different levels of cutting velocity (40, 50 and 60 m/min), feed rate (0.03, 0.05, 0.07 mm/rev) and constant drilling depth of 20 mm. The output response of cutting forces, torque, surface roughness, temperature, microhardness and tool wear was observed on both the condition while drilling super duplex stainless steel (2507). The experimental result reveals that the cryogenic coolant (LN2) reduces the cutting temperature for about 27.66–55.74% than wet cooling condition. With increased feed rate the thrust force and torque increases and related to increase in the cutting velocity the thrust force and torque reduced for both wet and cryogenic (LN2) conditions. The surface finish of the drilled hole was enhanced in cryogenic condition against wet condition. The minimum amount of flank wear was observed in the cryogenic condition through a scanning electron microscope (SEM).