Influence of Machining Parameters on Machinability of Inconel 718—A Review

Ni-based superalloy Inconel 718 is renowned owing to its admirable physical and mechanical properties at higher temperatures. Various industries including aerospace and automobile are using this superalloy in gas turbines and other components. Meanwhile, the excellent mechanical properties (high strength and hardness) of Inconel 718 cause poor machined surface integrity and machinability, which have always been an interesting task in the machining of superalloys. Countless studies are performed on the machinability of Inconel 718 defining optimal cutting parameters and for the advancement of a better understanding of superalloys’ machining like Inconel 718. Herein, a comprehensive review regarding the machining trends of Inconel 718 is offered and the causes of the various symbolic machining parameters are cited on numerous machinability features concerning the modern literature and the earlier one. The machining characteristics including cutting tool wear, cutting forces, and surface reliability such as microhardness, surface roughness, and residual stresses are reviewed.