End milling of Inconel 718 using solid Si3N4 ceramic cutting tools

Nickel based superalloys, like Inconel 718, are important materials with high strength in elevated temperature conditions and excellent corrosion resistance for the aerospace, energy and nuclear industries. However, the high-temperature strength compared with the low thermal conductivity and specific heat makes it difficult to machine. Thus, fast rising tool-wear is measured. To decrease material strength and to reduce tool-wear, previous studies have attempted to locally heat the workpiece. The main objective in using Si 3 N 4 -ceramic end milling tools is to exploit the temperature softening effect caused by high cutting speeds to raise the machining efficiency for manufacturing of Inconel 718.