Nickel-based superalloys are most commonly used in aerospace and marine applications owing to their superior mechanical properties. They show great resistance against creep and stress rupture at high temperatures. However, they are considered difficult to machine by conventional machining (CM) techniques owing to their low thermal conductivity, work hardening ability, presence of hard carbide particles, and chemical affinity toward various tool materials. Hybrid-assisted machining techniques can be an alternative to CM to improve the machinability of these alloys. Therefore, the present article discusses the effect of heat-assisted machining techniques like laser-assisted machining (LAM), flame-assisted machining (FAM), plasma-assisted machining (PAM), and induction-assisted machining (IAM) of Ni-based superalloys compared to CM. Additionally, cryogenic machining, ultrasonic vibration-assisted machining (VAM), and a combination of hybrid-assisted machining techniques on the machinability of Ni-based superalloys have also been discussed.
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