激光熔覆TiC／（Ni＋Cr）复合粉涂层的显微组织  

MICROSTRUCTURE OF LASER CLADDING TiC/(Ni+Cr) COMPOSITE POWDERS

作　　者：安世民[1] 梅雨[1] 

机构地区：[1]大连理工大学

出　　处：《金属学报》1996年第4期382-386,共5页Acta Metallurgica Sinica

摘　　要：用ＣＯ＿２连续激光在５ＣｒＮｉＭｏ钢表面熔覆（Ｎｉ＋Ｃｒ）包覆细颗粒ＴｉＣ复合粉末涂层．微观分析结果表明：ＴｉＣ颗粒周围优先被Ｃｒ相晶粒包覆；粘结金属在凝固应力作用下，Ｎｉ相晶粒形成滑移带，Ｃｒ相晶粒形成孪晶；ＴｉＣ不易溶解于液态（Ｎｉ＋Ｃｒ）中，而易溶于Ｆｅ基合金中；凝固过程中ＴｉＣ在涂层与基体的液相交互扩散区中析出，并发现碳化物（Ｆｅ，Ｃｒ）＿（２３）Ｃ＿６；同时还形成大量α和γ微晶。微晶的形成与高度弥散析出的ＴｉＣ晶核密切相关．Coating of TiC particles coated with Ni-Cr alloy on the surface of 5CrNiMo steel specimens has been obtained with CO2 continuous laser treatment. The microstructure of the coating was investigated. The results show that TiC grains are preferably encircled by Cr phase. The gliding band formed in Ni crystal and the deformation twinning formed in Cr crystal are due to solidified stress. The TiC phase in interdiffusion zone dissolves more easily in Fe-matrix than in Ni-Cr phase. The microcrystals of a and y phase were also observed and their formation is related to the dispersively precipitated TiC.

关 键 词：激光熔覆 显微组织 碳化硅 金属 涂层 

分 类 号：TG174.45[金属学及工艺—金属表面处理]