(1. 南昌航空大學(xué) 材料科學(xué)與工程學(xué)院，南昌 330063；
2. 南昌航空大學(xué) 信息工程學(xué)院，南昌 330063；
3. 海軍工程大學(xué) 理學(xué)院，武漢 430033)
摘 要: 采用激光-感應(yīng)復(fù)合熔覆方法，在黃銅基材表面制備Cu-Fe合金涂層，研究涂層的顯微組織與性能特征。結(jié)果表明，當激光掃描速度為3000 mm/min、粉末流量為110 g/min時，在黃銅基材上獲得表面較光滑、無氣孔與裂紋的Cu-Fe合金涂層。另外，Cu-Fe合金在激光-感應(yīng)復(fù)合熔覆過程中發(fā)生液相分離，在涂層底部，過飽和的金屬基體α-Fe呈平面狀與柱狀枝晶生長；在涂層中上部，直徑不等的球狀顆粒α-Fe鑲嵌在過飽和的金屬基體ε-Cu內(nèi)，許多細小的白色粒狀物ε-Cu在球狀顆粒α-Fe內(nèi)均勻彌散析出，涂層的平均顯微硬度相對于基材的提高約 2.8倍。
關(guān)鍵字: Cu-Fe合金涂層；黃銅基材；激光-感應(yīng)復(fù)合熔覆；顯微結(jié)構(gòu)
（1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China;
2. School of Information Engineering, Nanchang Hangkong University, Nanchang 330063, China;
3. School of Science, Naval University of Engineering, Wuhan 430033, China）
Abstract:Cu-Fe alloy coating was produced on the brass substrate by laser-induction hybrid cladding (LIHC). The microstructure and property of the coating were investigated. The results show that during LIHC when the laser scanning speed and powder feeding rate are 3000 mm/min and 110 g/min, respectively, the smooth, pore-free and crack-free Cu-Fe coating on the substrate is obtained. Furthermore, the liquid phase separation of Cu-Fe alloy takes place during LIHC. At the bottom of the coating, the supersaturated metal matrix identified as α-Fe presents the characteristics of planar growth and columnar dendritic growth. In the center of the coating, the spherical particles identified as α-Fe with different sizes are embedded in the supersaturated metal matrix ε-Cu. Large amounts of fine and white grains identified as ε-Cu phase precipitate inside the spherical α-Fe particles. As a result, the average microhardness of coating is about 2.8 times higher than that of the brass substrate.
Key words: Cu-Fe alloy coating; brass substrate; laser-induction hybrid cladding (LIHC); microstructure
