Laser directed energy deposition is useful for the manufacture and repair of aerospace components. Its inability to focus powder streams into narrow concentrations limits application for production of fine (<1 mm) features. In the case of magnetic feedstock materials, use of a magnetic field in the track vicinity can allow successful manipulation of track properties. In this work, a solenoid coaxially aligned to the laser beam is used to manipulate track dimensions and powder behaviour. A methodology is demonstrated which allows magnetic fields to dynamically manipulate processing conditions. An improvement to material efficiency of 25 % was achieved, and the effects of critical parameters were also examined. A solenoid fixed to a specific location along the toolpath was used to increase the cross-sectional area of tracks by up to 83 % in those positions. The placement of magnetic fields in the deposition zone were systematically investigated to better understand the mechanisms of powder incorporation. Magnetic manipulation of magnetic feedstocks in DED should therefore be considered as an adaptive control technique in cases where greater control of track dimensions or enhanced material feed control is required.

激光定向能量沉积可用于制造和维修航空航天部件。它无法将粉末流集中到狭窄的浓度，限制了其在精细 (<1 毫米) 特征的生产中的应用。在磁性原料材料的情况下，在轨道附近使用磁场可以成功操纵轨道特性。在这项工作中，与激光束同轴对齐的螺线管用于操纵轨道尺寸和粉末行为。展示了一种允许磁场动态操纵加工条件的方法。材料效率提高了 25%，并且还检查了关键参数的影响。沿刀具路径固定到特定位置的螺线管用于将这些位置的轨迹横截面积增加多达 83%。系统地研究了沉积区中磁场的位置，以更好地了解粉末掺入的机制。因此，在需要更好地控制轨道尺寸或增强材料进料控制的情况下，应将 DED 中磁性原料的磁性操作视为一种自适应控制技术。