|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Applications of Solidification Fundamentals
||On Mesoscopic Surface Formation in Metal Laser Powder Bed Fusion Process
||Shanshan Zhang, Subin Shrestha, Kevin Chou
|On-Site Speaker (Planned)
During laser powder bed fusion (LPBF), the surface formation of the selected-melted powder bed region is subject to a melting-solidification process along the line-scans and sensitive to the process conditions. This study focuses on the surface formation of mesoscopic line-scans in LPBF, and aims to investigate the effect of different process parameters, such as laser power, hatch spacing and layer thickness, on the track morphology and surface roughness. For this purpose, single-track and dual-track scans made by an LPBF system were characterized under a white-light interferometer. A discrete element method and 3D thermo-fluid modeling were applied to simulate powder spreading and laser scanning. The results show that the roughness of the quasi-steady regions on the line scans is significantly dependent on the process parameters both longitudinally and transversely. As a result of continuous melting in dual-track scans, the interface displays rougher profiles than the individual tracks along the longitudinal direction.
||Additive Manufacturing, Other, Other