Process parameters optimisation of the Direct Laser Metal Deposition technique

Direct Laser Metal Deposition (DLMD) is actually one of the most attractive techniques in the group of Material Accretion Manufacturing (MAM) processes. The objective of this work was to study the effect of two DLMD process parameters, hatch spacing and step height, on the quality of built parts, in terms of density and microhardness. The experimental equipment was constituted by a 6 axis CNC laser machine and by a pneumatic system for the distribution of the powder. The powder chosen for the experimentation was the atomized Colmonoy 227-F, a nickel alloy especially designed to manufacturing moulds. Results of experimentation showed that it is possible to produce parts having properties comparable with those obtainable with conventional processes.