Sensing for directed energy deposition and powder bed fusion additive manufacturing at Penn State University

摘要: Additive manufacturing of metal components through directed energy deposition or powder bed fusion is a complex undertaking, often involving hundreds thousands individual laser deposits. During processing, conditions may fluctuate, e.g. material feed rate, beam power, surrounding gas composition, local and global temperature, build geometry, etc., leading to unintended variations in final part microstructure properties. To assess control as-deposited quality, researchers have used variety methods, including those based on sensing melt pool plume emission characteristics, characteristics application, layer-wise imaging. Here, summary ongoing process monitoring activities at Penn State provided, along with discussion recent advancements the area image acquisition analysis during processing. Specifically, methods that enable direct comparisons CAD model, images, 3D micro-tomographic scan data will be covered, thoughts how such analyses can related overall quality.