|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Powder Materials Processing and Fundamental Understanding
||Understanding Surface Roughness on Vertical Walls in Laser Powder Bad Fusion Additive Manufacturing
||Tianyu Zhang, Lang Yuan
|On-Site Speaker (Planned)
In the laser powder bed fusion (LPBF) additive manufacturing process, parameters such as laser scanning speed and power have overarching effects on the development of melt pool and surface roughness, all of which contribute significantly to the final material integrity and mechanical properties. In this study, a wide range of energy densities (calculated based on the laser power, scanning speed, and hatch spacing) on stainless steel 316L powder were systematically investigated experimentally and numerically for cubic samples in LPBF. The correlations between energy density and surface roughness on vertical walls were discussed in detail via examining the melt pool dimensions, microstructural characteristics and surface topography. Mechanisms that drive surface roughness on vertical walls were proposed based on the analysis of partially attached particles and isolated balling effect. Methods to control the surface roughness on vertical walls based on the mechanisms were established and demonstrated in LPBF.
||Additive Manufacturing, Modeling and Simulation, Characterization