Comparison the machinability of Inconel 718, Inconel 625 and Monel 400 in hot turning operation

In the present paper, three nickel base alloys (Inconel 718, Inconel 625 and Monel-400) have been studied for chip formation in the hot turning process using flame heating. Cutting force, tool life, chip morphology, tool wear, and surface integrity (surface roughness and microhardness beneath the machined surface) have been determined in both room and hot temperature conditions (300 °C and 600 °C). Flame heating (Liquefied petroleum gas and oxygen) along with turning operation has been utilized for machining of three materials. It was observed that significant reduction of cutting force, tool wear, chatter formation, surface roughness and increase tool life, chip tool contact length, etc., for all three nickel base alloys in hot machining compared to room temperature machining.