|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, 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. Therefore, understanding the effect of contour processing parameters on the part’s surface characteristics and geometrical accuracy becomes critical. In the present 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) were used to improve the surface quality. The results suggested that all the three parameters (beam current, scanning speed, and focus offset) are similarly important in the contour region. The surface area roughness (Sa) values were in the range of 50-111 Ám.
||Planned: At-meeting proceedings; Planned: At-meeting proceedings