Machinability Investigation of Inconel ۶۵۷ in High-speed Turning

A high strength nickel chromium alloy (۵۰Cr-۵۰Ni-Nb alloy), commonly referred to as IN-۶۵۷, is specifically used for components in furnaces which are fired by low grade fuel oils containing high levels of vanadium, sodium and sulphur. The purpose of this study is to experimentally investigatethe effect of machining parameters on machinability in turning of Inconel ۶۵۷. The considered parameters were cutting speed, feed and tool material. Cutting force components, tool flank wear and surface roughness were measuredbased on design of experiments, and then analysis of variance was performed. Experimental results show that tool wear of CBN tools is ۵۰ %lower than that of carbide tools. The Tool material with percentage contribution of ۴۸% and ۵۶% is the main parameter that influencesthe cutting forces and the flank wear, respectively. Also, the cutting speed with percentage contribution of ۴۸% is the main parameter that effects the surface roughness. The lowest surface roughness is attained by the cutting speed of ۲۵۰ m/min and the feed of ۰.۰۵ mm/rev by the CBN tool.

Keywords:

Inconel ۶۵۷ , Machinability , Cutting force , Tool flank wear , Surface roughness