• Sekar, K. S. Vijay
• Prabhu, Srikanth
• Sekar, Vijay
• Vimalesh, M.

Abstract

<jats:p>Inconel 718, a Nickel based superalloy is widely used for aerospace applications mainly due to its high temperature resistance and high strength to weight ratio. Its poor machinability is a limiting factor in commercial, cost intensive applications. This paper investigates the machinability of Inconel 718 in high speed drilling. The impact of the material on thrust forces, torque and chip microstructure have been measured at four different cutting speeds – 19, 27,43 and 67 m/min. The high tensile strength coupled with low thermal conductivity compounds the machining process. The thrust forces decrease with cutting speed, but the torque fluctuates at intermediate cutting speeds. Chip formation is continuous across cutting speeds, with thin cross sections and evidence of saw tooth edges. Inconel work hardens more than titanium alloys and shows good ductile to brittle transition at low temperatures creating chips of lesser length as observed using scanning electron microscopy.</jats:p>

Topics

• impedance spectroscopy
• compound
• nickel
• scanning electron microscopy
• strength
• titanium
• titanium alloy
• tensile strength
• thermal conductivity
• superalloy