|About this Abstract
||MS&T23: Materials Science & Technology
||Metal Powder Synthesis and Processing: Fundamental Aspects and Modeling
||Understanding the Geometry Accuracy and Surface Roughness of Thin Wall Structures for 316L Stainless Steel in Laser Powder Bed Fusion Additive Manufacturing
||Tianyu Zhang, Loewer Matthew, Haralson Reid, Lang Yuan
|On-Site Speaker (Planned)
The precision of thin wall structure is a crucial aspect in laser powder bed fusion, and it is significantly influenced by the surface roughness and printing strategies employed. Previous research has revealed that the formation of dross under high energy density conditions worsens the vertical surface roughness. In this study, we investigated the impact of laser power and scanning patterns on thin walls with varying gaps. The result reveals that the migration of the melt pool induces dross formation, which leads to a significant inaccuracy in the design gaps and thin wall dimensions. A large geometry error occurs when high energy density conditions were used for thin walls with minimal gaps. Samples with proper inner offset distance resulted in better surface quality, and the geometry accuracy was significantly affected by the hatch generation. The parts' orientation relative to the recoating and argon flow direction did not influence the geometry accuracy.