ABSTRACT
Ni-alloys, like lnconel 718, are difficult to machine. This is mainly due to their special material properties (low thermal conductivity, tendency to strain harden and to adhere to the cutting tools). The high tensile strength (Rm) of nickel-based
materials at elevated temperatures (approx. tensile strength Rm = 1100 N/mm2 at 700°C) causes a high mechanical load on the tools. Especially, the abrasive resistance (hardness) and plastic deformation of the tool material are important. Because of the complex loads imposed on cutting tools, a tool design for machining Inconel 718 must offer high toughness, high hardness, high chemical resistance and an excellent resistance against Inconel 718 adhesion to the cutting tool at the same time [1].
