Abstract Scope |
Electron Beam Powder Bed Fusion (EB-PBF) Additive Manufacturing has demonstrated applicability for a variety of materials, including high-temperature refractory metals and crack-prone nickel superalloys, as well as control over local microstructures. However, the benefits of rapid fabrication and microstructural control are overshadowed by long certification times associated with the prediction, measurement, and mitigation of defects at different physical scales. Therefore, in-situ techniques that yield a layer-by-layer spatial distribution of defects have generated significant interest. However, for EB-PBF, key challenges exist. Sensors must be resistant to metallization, heat, powder contamination, and x-ray damage. In this presentation, we will provide a review of the recent literature and industrial application of salient sensing technologies for EB-PBF with a highlight on recent work toward the collection and interpretation of in-situ backscattered electron data. We will discuss the capabilities and limitations of each approach in the context of recent advances in materials and applications. |