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为了实现块体和圆管的激光熔覆成形,通过实验研究了扫描速度、激光功率和送粉速率对Ni25粉末单熔覆层的高度和宽度的影响规律,建立了熔覆层高度和宽度分别与扫描速度、激光功率和送粉速率之间的对应关系.在此基础上,根据对应关系,选择优化的成形参数(扫描速度6 mm/s,激光功率900 W,送分速率0.1 rpm),配合搭接率的计算(30％)和成形路径设计,使用多层多道激光熔覆成形技术实现了块体和圆管的成形.使用扫描电子显微镜分析成形件的内部组织结构,结果表明成形件内部组织致密,成分均匀,晶粒尺寸分布在18 μm左右范围内.“,”In order to obtain block and tube made from laser cladding rapid manufacturing (LCRM),the effects of scanning speed,laser power and powder feeding rate on Ni25 cladding layer height and width are studied by conducting single-layer LCRM experiments.Relations between sizes of cladding layers and forming parameters are established by data analysis.Based on these relations,Ni25 block and tube are produced from milti-layer-multi-channel LCRM,with the help of parameters optimizing,overlap rate calculating and scanning path designing.Scanning electronic microscope (SEM) analysis shows that LCRM workpieces with compact microstructure,homogeneous composition and around 18 μm grain size distribution.