Development of new alloy 718 with super machinability

Abstract

Alloy 718 has been applied in a lot of applications such as aerospace, power generation plant, automobile and Oil & Gas. Most products of Alloy 718 are finally produced by machining process because there are a lot of complex product shapes. Therefore, improvement of the machinability can contribute to the manufacturability. One of the important factors for the machinability is large carbide because carbide has very high hardness. Distribution and size of carbides strongly influence on cutting tool life. New developed Alloy 718 has low carbon content to suppress the formation of NbC type carbides. Developed alloy extremely improves turning tool life in comparison with conventional Alloy 718. Moreover, developed alloy satisfies chemical compositions and mechanical properties of AMS 5663N and API 6ACRA.