As prosperous in automobile and aerospace industries, the competition in machining industry is getting fierce. The requirements for product lie on not only the improvement of the quality, but also the processing speed. The Nickel based superalloy can maintain a very good strength under highly elevated temperature, so it is wildly applied to the components and parts which need to resist to high temperature, such as blades of aircraft turbine engines, rotors, turbine parts for nuclear power plants, heat exchangers, reciprocating engines, heat-treating equipments, liquid rockets, space vehicles and equipments for chemical and petro chemical industries. Nevertheless, Nickel based superalloy’s high strength, low thermal conductivity and working hardening will lead to a short cutting tool life and low efficiency in machining. At the same time, AISI4340 is also widely applied to processing parts for gears, piston, automobiles and machines.