(1. 哈尔滨工业大学 先进焊接与连接国家重点实验室，哈尔滨 150001；
2. 上海航天设备制造总厂，上海 200245)
摘 要: 利用丝粉同步激光沉积技术直接制备成型良好的WCp/Al复合材料单层与叠层沉积件，对工艺参数进行优化，获得了成型良好的单层沉积件。结果表明：可通过改变束流气的大小来改善WC颗粒分布的均匀性；降低激光功率可削弱热积累对叠层沉积件成型造成的有害影响，但激光功率的降低存在一临界值；沉积件冶金质量良好，区域微观结构较为均匀。底层沉积层组织存在由柱状晶向枝晶的转变，WC及Ti的存在会抑制柱状晶的生长，并且可以起到细化晶粒的作用；随着沉积层层数逐渐增加，热积累作用逐渐增强，枝晶的尺寸会逐渐增加。
关键字: 激光沉积；WCp/Al复合材料；丝粉同步；微观组织
（1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
2. Shanghai Aerospace Equipment Manufacturer, Shanghai 200245, China）
Abstract:The well-formed monolayer and laminated WCp/Al composites were fabricated by coincident wire-powder laser deposition. The ideal macroscopic shape of single layer deposition was obtained through parameters optimized. The results show that the uniformity of the WC particles distribution can be improved by changing the size of the beam gas, and reducing the laser power can reduce the detrimental effects of the heat accumulation on the multilayer deposition. However, there is a critical value in the reduction of laser power. The metallurgical quality of the deposit is good and the regional microstructure is uniform. The existence of WC and Ti will inhibit the growth of columnar crystals, and the grain size can be refined. With the increase of the number of sedimentary layers, the heat accumulation effect is gradually strengthened. The size of the dendritic will gradually increase.
Key words: laser deposition; WCp/Al composites; coincident wire-powder feeding; microstructure
