|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Building the Pathway towards Process and Material Qualification
||A-68: Process Parameter Optimization Strategy for Ni-based Superalloy in Electron Beam Melting Additive Manufacturing: As-built Part Quality and Microstructure
||Yousub Lee, Mike Kirka, Alfredo Okello, Jake Bultman, Naren Raghavan, John Turner, Ryan Dehoff
|On-Site Speaker (Planned)
Electron Beam Melting (EBM) additive manufacturing involves complex thermal characteristics stemming from different process parameters, which significantly influence as-built quality and microstructure. However, the thermal variations during deposition have not been fully understood due to lack of experimental measurement for EBM process. The optimization of the process highly requires an understanding of melt pool geometry and temperature distribution. A three dimensional transient numerical model is used to capture thermal profile and melt pool geometry at the EBM process. The parameters of scan velocity, focus offset, line offset and line order are systematically varied to find an optimal condition of EBM process in a Ni-based superalloy. Later, the predicted results are utilized to quantitatively study the effect of scan velocity, focus offset, line offset and line order on the formation of defects and as-built surface quality. The internal porosity and surface topology are characterized using optical microscopy and image processing software.
||Planned: Supplemental Proceedings volume