|About this Abstract
||Materials Science & Technology 2020
||Additive Manufacturing: Qualification and Certification
||Pore Formation in Laser Powder Bed Fusion Inconel 718 through Multiphysics Modeling
||Qian Chen, Seth Strayer, Albert To
|On-Site Speaker (Planned)
Laser powder bed fusion (L-PBF) is an important additive manufacturing technology which allows the direct fabrication of metal parts with intricate internal structure in a layer-by-layer manner. Despite the wide industrial applications, LPBF process still suffers from a variety of issues in the fabricated part quality where porosity generation is a key issue not well studied and tackled. In this study, a multiphysics model is developed to study the formation and evolution of porosity for Inconel 718 in LPBF. Before laser scanning simulation, powder particle distribution for each layer is obtained from the powder lay and spread simulation by discrete element method (DEM). Lack of fusion pores have been found with a larger hatching space and can be eliminated with smaller hatching space. Moreover, it is observed that pore formation is tightly associated with its neighboring powder particle distribution which can be attributed to denudation.