2:30 p.m. Location: ECSS 3.503
Laser assisted additive manufacturing with blown powder, which is also called Directed Energy Deposition (DED), is a nontraditional but very popular advanced manufacturing process. With highly concentrated energy from laser beam, a spatially and temporally mobile melted pool is generated on the substrate, which moves following numerical-controlled (NC) toolpaths. The supplied metal powder is blown into the melted pool by argon gas, melted rapidly, and then solidifies with high cooling rate. A three-dimensional part is fabricated successfully from bottom to top with layer-by-layer style. This presentation will introduce author’s distinctive current/future researches in utilizing laser assisted AM’s advantages (flexibility, high-efficiency, rapid solidification, etc.) to fabricate multi-functional materials with customized compositions, repair metallic part, improve part’s strength and manufacturing productivity through high laser transverse speed. This presentation will also introduce author’s research achievements and plans in modeling AM process, including thermal history, phase change, powder flow, microstructure morphology, and thermodynamics analysis in multi-material system. Finally, author will introduce a long-term plan to link process, microstructure, and property of additive manufacturing parts based on multi-physical models.
Dr. Wei Li is currently a Post-doctoral Researcher in the Department of Mechanical and Aerospace Engineering at University of California, Davis. His research interests include several distinctive fields in laser assisted additive manufacturing. These distinctive researches involve multi-functional materials with customized compositions, metallic part repair, high-speed DED, multi-physics modeling additive manufacturing process (thermal model, powder flow model, phase change, multi-materials thermodynamics, microstructure simulation based on Monte Carlo Potts model). Dr. Li earned his Ph.D. degree in Mechanical Engineering from Missouri University of Science and Technology (former Missouri University-Rolla) in 2018. He has two M.S. degrees: one in Manufacturing Engineering from Missouri University in 2017, the other in Aerospace Engineering from Tongji University in 2012. During his graduate years, he published twenty journal papers (nine journals as first author), one US Patent App (first inventor), and one NASA technology transfer (first inventor). He received Dean's Ph.D. Scholar of College of Engineering and Computing at Missouri University in 2018. After he earned his Bachelor’s degree in Mechanical Engineering, he worked as manufacturing engineer for four years in China Aerospace Science and Technology Corporation.