熔覆工艺对Ni60A激光熔覆层微观组织的影响  

Effect of Cladding Technology on Microstructure of Laser Clad Ni60A Coating

作　　者：陈传忠[1] 边洁[1] 王佃刚[1] 董秀梅 雷廷权[3] 

机构地区：[1]山东大学材料科学与工程学院,济南250061 [2]济南仪表厂,济南250022 [3]哈尔滨工业大学,哈尔滨150001

出　　处：《应用激光》2001年第6期381-384,共4页Applied Laser

摘　　要：采用 SEM、TEM和 EDAX等方法研究了熔覆工艺对 Ni6 0 A激光熔覆层微观组织的影响。熔覆层由胞枝状 γ- Ni基固溶体、树枝状 M7C3 、颗粒状 Cr B、Ni+ M2 3 C6及 Ni+ Ni3 B共晶组织组成 ,结合区由具有定向快速凝固组织特征的胞状共晶组织组成 ,结合区底部的熔合带是由 γ- (Fe,Ni)固溶体形成的平面晶。相同工艺参数的搭接熔覆使涂层的稀释度增大 ,在保证涂层与基体形成良好冶金结合的前提下 ,适当增大扫描速度或降低功率密度有利于涂层组织的细化 。By means of SEM,TEM and EDAX,the effect of cladding technology on the microstructure of the laser clad Ni60A coating is studied.The coating consists of cellular-dendritic γ-Ni based solid solution,dendritic M 7C 3,granular particle CrB,Ni+M 23 C 6 and Ni+Ni 3B eutectic structures.Bonding zone is composed of cellular eutectic structures with directional fast solidified structure features. Bonding belt of the botton of the bonding zone is composed of plane crystal formed by γ-(Fe,Ni) solid solution.The lapped cladding of the same parameters makes the dilution of the coating increase.In the guarantee of the forming of the metallurgical combination between coating and substrate,increasing scanning speed or decreasing power density properly will profit the refinement of the coating structure and decrease the dilution of the coating by substrate.

关 键 词：激光熔覆层 NI60A 微观组织 熔覆工艺 镍合金 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TG174.44[金属学及工艺—金属材料]