|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Additive Manufacturing and Innovative Powder/Wire Processing of Multifunctional Materials
||Directed Energy Deposition of AF9628: Process Optimization and Overhang Compensation
||Clara Mock, Josh Taggart-Scarff, Brandon McWilliams
|On-Site Speaker (Planned)
Process parameters for high strength, high hardness AF9628 steel were successfully developed for Directed Energy Deposition (DED) to enable the creation of large-scale parts with complex features such as internal overhang features. The deposition efficiency for unsupported layers decreases rapidly for overhangs of a critical angle (often quoted as 10 degrees from the vertical) resulting in a failure to build the overhang section of the part. AF9628 DED process development was conducted by varying laser power, speed and layer height to build weld tracks, small walls and cubes. Parameters were down selected based on evenness of weld tracks, minimum porosity and hardness. The overhang compensation was investigated for overhang angles from 20-45° as a function of contour speed from 381-1016 mm/min (15-40 in/min). Part geometry was investigated by measuring the overhang angle with a coordinate measuring machine and roughness via confocal microscopy.
||Additive Manufacturing, Iron and Steel, Mechanical Properties