Blown powder directed energy deposition of SS316L powder is carried out on various substrate surface conditions of SS304 such as cleaned, sand blasted, milled, oily, cold galvanised and painted to study their influence on the process. High-speed imaging is used for process observation and the deposited tracks are analysed qualitatively and quantitatively using surface images, cross sectional macrographs and x-ray images. Frames from high-speed imaging reveal the removal of additional material from the substrate surface such as paint and oil. The stages involved in their removal: peeling and evaporation are presented. EDS analysis showed that no additional elements other than powder and substrate material are found in the track volume. The quantitative results for all specimens show that the surface conditions had minor influences on track width, track height, wetting angle, dilution and deposited cross sectional area. Defects such as porosity, inclusions and cracking were not observed related to the surface conditions. These findings could significantly reduce processing time by skipping the cleaning step before directed energy deposition such as laser cladding or repair in industrial applications.

SS316L 粉末的吹制粉末定向能量沉积在 SS304 的各种基材表面条件下进行，例如清洁、喷砂、研磨、油性、冷镀锌和涂漆，以研究它们对工艺的影响。高速成像用于过程观察，并使用表面图像、横截面宏观照片和 X 射线图像对沉积的轨迹进行定性和定量分析。高速成像的帧显示从基材表面去除了额外的材料，如油漆和油。介绍了去除它们的阶段：剥落和蒸发。EDS 分析表明，在轨道体积中没有发现除粉末和基材材料之外的其他元素。所有试样的定量结果表明，表面条件对轨道宽度的影响很小，轨道高度、润湿角、稀释度和沉积横截面面积。未观察到与表面状况相关的缺陷，例如孔隙率、夹杂物和裂纹。这些发现可以通过在定向能量沉积（例如工业应用中的激光熔覆或修复）之前跳过清洁步骤来显着减少处理时间。