(1. 哈爾濱工業(yè)大學(xué) 先進焊接與連接國家重點實驗室，哈爾濱 150001；
2. 上海航天設(shè)備制造總廠，上海 200245)
摘 要: 利用絲粉同步激光沉積技術(shù)直接制備成型良好的WCp/Al復(fù)合材料單層與疊層沉積件，對工藝參數(shù)進行優(yōu)化，獲得了成型良好的單層沉積件。結(jié)果表明：可通過改變束流氣的大小來改善WC顆粒分布的均勻性；降低激光功率可削弱熱積累對疊層沉積件成型造成的有害影響，但激光功率的降低存在一臨界值；沉積件冶金質(zhì)量良好，區(qū)域微觀結(jié)構(gòu)較為均勻。底層沉積層組織存在由柱狀晶向枝晶的轉(zhuǎn)變，WC及Ti的存在會抑制柱狀晶的生長，并且可以起到細化晶粒的作用；隨著沉積層層數(shù)逐漸增加，熱積累作用逐漸增強，枝晶的尺寸會逐漸增加。
關(guān)鍵字: 激光沉積；WCp/Al復(fù)合材料；絲粉同步；微觀組織
（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
