|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Application of Solidification Fundamentals to Challenges in Metal Additive Manufacturing
||Heat Transfer and Fluid Flow during Fabrication of Overhang Structure in Laser-powder Bed Fusion Additive Manufacturing
||Yi Li, Yousub Lee, Wei Zhang
|On-Site Speaker (Planned)
Compared to directed energy deposition additive manufacturing processes, powder bed AM (such as laser-powder bed fusion) has distinct advantages in building complex structures such as overhangs. As overhangs sit on top of loosely-packed powder, the significantly reduced heat sink changes molten pool geometry. The present study aims to better understand molten pool evolution during fabrication of overhang structures. Discrete element model is used to calculate the arrangement of particles on the powder bed under the overhang. This arrangement is then imported into a transient heat transfer and fluid flow model to examine temperature evolution. For experimental validation, particle packing of AISI 316L powders are scanned by micron-resolution X-ray computerized tomography. Overhang structures are fabricated in a sensor laser test bed equipped with a high-speed video camera and a two-color infrared camera. The effects of processing parameters on overhang structure characteristics are discussed based on the computational and experimental results.
||Planned: Supplemental Proceedings volume