|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Applications of Solidification Fundamentals
||Undercooling in Laser Powder Bed Fusion Metal Additive Manufacturing
||Meelap M. Coday, Minglei Qu, Qilin Guo, Lianyi Chen
|On-Site Speaker (Planned)
Undercooling is the most important parameter determining nucleation and growth of phases during solidification, yet the undercooling for metals under additive manufacturing (AM) conditions is still unclear. Here, we report the estimation of undercooling in the laser powder bed fusion (LPBF) AM process from the solidification rate measured by in-situ high-speed synchrotron x-ray imaging, based on the dendrite growth velocity model. The undercooling as a function of location and time and its dependence on material properties are revealed. The undercooling estimation method reported here provides a way to estimate the undercooling values of materials under additive manufacturing conditions. The temporal and spatial variation of the undercooling and the dependence of undercooling evolution trend on material properties revealed here are important for understanding microstructure evolution in fusion-based metal additive manufacturing processes.