Effects of Alloy 718 (Inconel) super alloy cutting parameters on surface roughness

Alloy 718, alias INCONEL, is a high-strength, corrosion-resistant nickel chromium material used at -252° to 705°C. It is an austenitic nickel-base super alloy which is used in applications requiring high strength to approximately 760°C and oxidation resistance to approximately 982°C. In addition, the alloy exhibits excellent tensile and impact strength even at cryogenic temperatures. In this study, Alloy 718 was processed at various cutting speeds (100-220 rpm) and using three different cooling techniques (dry cut, MQL and CO2 ) and the factors affecting surface roughness were analysed using Taguchi, RSM and ANOVA methods. However, the interaction of the factors affecting the surface roughness is also shown graphically. The measurements and analysis results show that the cutting parameters that minimize surface roughness are obtained with high cutting speed and high MQL values.