采用 CO 2横流激光器通过预置粉末方式，在 Cr12MoV 模具钢表面熔覆了添加稀土钕元素的镍基合金熔覆层；通过 X 射线衍射仪、扫描电镜、显微维氏硬度仪、摩擦磨损试验机等研究了稀土钕元素的添加量对镍基合金熔覆层显微组织和性能的影响.结果表明：加入1．5％钕(质量分数，下同)的熔覆层中枝晶生长的方向性减弱，组织趋向均匀，耐磨性能得到明显改善；加入2．5％钕的熔覆层组织更加致密，并且表现出最优的摩擦磨损性能；加入3．5％钕的熔覆层中出现组织变大的趋势，粗大硬质相颗粒增多，并且有气孔产生，熔覆层性能下降明显.
The Ni-base alloy layers with the addition of rare earth element neodymium were cladded on the surface of Cr12MoV die steel by a CO 2 transverse flow laser with the preset-powder method.The microstructures and properties of the Ni-base alloy layer were investigated by X-ray diffraction,scanning electron microscopy, Vickers microhardness test and wear test.The results show that with the addition of 1.5wt% neodymium,the dendrite growth directivity in the cladding layer was weakened,the microstructure tended to be uniform and the wear resistance increased obviously.With the addition of 2.5wt% neodymium,the cladding layer had a relatively compact microstructure and showed the best anti-wear performance.With the addition of 3.5wt% neodymium,the size of the microstructure in the cladding layer tended to be large,and the amount of coarsened hard phase particles increased and the pores were produced,resulting in the obvious decrease of the properties of the cladding layer.
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