激光熔覆成形Ni基合金层的研究  

Research on Ni-base Alloy Coating Formed by Laser Cladding Process

作　　者：郭华锋[1] 李志[1] 周建忠[2] 徐大鹏[2] 

机构地区：[1]徐州工程学院机电工程学院,江苏徐州221008 [2]江苏大学机械工程学院,江苏镇江212013

出　　处：《热加工工艺》2008年第11期77-80,共4页Hot Working Technology

基　　金：徐州工程学院科研基金项目(XKY2007231)

摘　　要：采用同轴送粉式激光熔覆工艺对Ni基合金粉末进行单道单层、单道多层及多道多层熔覆成形实验。结果表明:所形成的熔覆层与基体为冶金结合;内部组织由大量的枝晶和等轴晶构成且组织均匀、致密;熔覆层硬度最高达771HV0.2,为基体材料硬度的3～4倍,耐磨性显著提高;熔覆层内部无气孔出现,局部存在少量微观裂纹。The laser cladding process with coaxial powder feeding was used to proceed the experiments of forming Ni-based alloy coating by the way of single-track single-layer, single-track multi-layer and multi-track multi-layer methods. The experimental results indicate that the formed coating is metallurgically bonded with substrate; the interior structure is composed of lots of dendritic and equiax crystal which is uniform and densifieation; the highest hardness of cladding layer is 771HV0.2, which is the 3 -4 times more than substrate and the wear resistance is improved obviously; and the gas cavity can not found in cladding layer but micro-crack can found a little.

关 键 词：激光技术 熔覆成形 NI基合金 显微组织 

分 类 号：TG174.44[金属学及工艺—金属表面处理]