Metal Additive Manufacturing Conference 2019

Abstract Electron Beam Melting (EBM) is one of the important metal AM processes especially feasible for manufacturing with high-performance or superalloy like Inconel. This research is carried out to evaluate feasibility of manufacturing Inconel 625 by the EBM process. Focusing on process parameters such as speed function for hatching process and the line offset for both contouring and hatching process, nearly full dense samples- over 99.7% of the wrought material - were produced. As expected, the surface roughness variation between the samples printed with and without contour, as peak to valley distance (Rt), indicated greater need for the post-process machining. The measured Vickers Hardness (30HV30) of density cubes reached a level equivalent to as-rolled and annealed materials. The samples machined from bulk specimens exhibited good tensile properties, as well as the near-net shaped specimens with only 2 mm in radius machining for final specimen dimensions. However, the significant differences can be observed between the samples fabricated with and without contour. The test results showed the potential of EBM process to manufacture with the Inconel 625 materials; however, the process parameters should be further optimized. In addition, an in-depth analysis of the differences between the samples fabricated with and without contour should be carried out in detail. Key Words: Additive Manufacturing, Electron Beam Melting, Inconel 625, Near-net Shape Manufacturing