Influence of advanced coated tools on surface integrity characteristics of Nimonic C263

Abstract

Advanced coated tool and cooling techniques were used for trial on Ni-based superalloy Nimonic C 263 to improve surface integrity, such as a white layer, grain refinement, and surface defect. Toolmaker microscope, Field emission scanning electron microscopy (FESEM), and X-ray diffraction (XRD) system were employed to characterize the tool after machining, machined surface, and subsurface alteration. A possible cause of tool failure at high cutting speed and feed was severe plastic deformation and chipping of the cutting edge and nose, abrasive nose and flank wear, and the formation of a built-up layer (BUL). The white layer, surface defect, and grain refinement are always found less on machined surfaces with the PVD-coated tool under dry machining than with an uncoated tool under wet machining at a high rate. TiN/TiAlN multilayer coated WC tool can be suggested for good machinability and surface integrity in a sustainable, eco-friendly way to the industry for machining Nimonic C-263. MQL and flood mode cooling are also preferred at a cutting speed near 84 m/minute and a feed rate of 0.14 mm/rev.