|About this Abstract
||Materials Science & Technology 2019
||Additive Manufacturing of Metals: Microstructure and Material Properties of Nickel-based Alloys
||Influence of Contour Parameters on the Surface Characteristics and Geometrical Accuracy of EB-PBF Built Alloy 718
||Paria Karimi, Christopher Schnur, Esmaeil Sadeghi, Joakim Ålgårdh, Joel Andersson
|On-Site Speaker (Planned)
Electron beam-powder bed fusion (EB-PBF) technique has achieved a great attention due to its innumerable potentials such as near-net-shape production and capability for production of high geometrical complexities. These characteristics also allow EB-PBF built parts to be implemented without post processing. However, it must be noted that the as-built rough surface introduces a detrimental effect on the mechanical properties of parts. In this study, different process parameters (beam scanning speed of 200-650 mm/s, beam current of 7-15 mA, and focus offset of 0-20 mA, number of contours of 1 & 2)) were used to improve the surface quality. The results showed, in the one-contour samples, the scanning speed, and in the two-contour samples, the beam current, as well as focus offset, were the most effective parameters on Sa. Generally, the two-contour samples delivered lower Sa (~ 22%) but with slightly more porosity content (~ 8%) compared to the one-contour samples.
||Planned: At-meeting proceedings