|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Applications of Solidification Fundamentals
||Prediction of Columnar-to-equiaxed Transition in Single Tracks during Laser Powder Bed Fusion Additive Manufacturing
||Lang Yuan, Adrian S Sabau, David StJohn, Arvind Prasad, Peter D Lee
|On-Site Speaker (Planned)
Highly customized microstructures of the printed alloy formed during laser powder bed fusion additive manufacturing can be produced by tailoring the transition from columnar to equiaxed grains (CET). In this study, classic analytical solutions for both thermal diffusion and solidification are applied to solidifying melt pools to evaluate the formation of CETs for a wide range of combinations of laser power, speed and substrate temperature. This high-throughput tool effectively scans process parameters and provides potential indicators for target microstructures. Process parameters that the analytical solutions suggest may result in the desired columnar or fully equiaxed microstructure are examined in detail using a massively parallelized microstructural solidification model to reveal both nucleation and grain growth during multiple-layer solidification. The Interdependence theory and observations from controlled LPBFAM experiments are discussed to interpret the numerical predictions and provide insights for controlling CET during the LPBFAM processing.
||Additive Manufacturing, Modeling and Simulation, Solidification