• Analysis of machining performance of Inconel 718 printed by PBF-LM (powder bed fusion laser melting)

      Diaz-Alvarez, A; Diaz-Alvarez, J; Wood, P; Gunputh, U; Rusinek, A; Miguelez, M; University of Derby (2021)
      Additive manufacturing based on powder bed fusion laser melting (PBF-LM) is receiving increased attention in nickel-base superalloys manufacturing, due to the difficulty of removal processes of superalloys. PBF-LM process involves the use of high-energy laser beam (continuous or pulsed) to melt a thin layer of metal powder under an inert or near-inert gas atmosphere. After rapid solidification, a new layer of powder is deposited and exposed again to the laser, repeating the process until the whole piece is obtained. The Inconel 718 alloy is one of the most widely used nickel-based alloys in jet engines and industrial steam turbines for components that operate at high temperature and require high resistance to fatigue and corrosion. Additive manufacturing processes commonly require further finishing operations in order to achieve dimensional and surface specifications of the workpiece. The present study focuses on the analysis of machining of Inconel 718 pieces manufactured through the PBF-LM process, when it is compared with the reference piece manufactured through conventional method. This paper investigates the cutting forces and the relationship to tool wear in machining Inconel 718 alloy obtained through the PBF-LM technique and conventional methods.