通过扫描电镜(SEM)研究了稀土氧化物La2O3对铁基合金激光熔覆层组织形貌的影响，用纳米硬度探针测定了熔覆层与基体界面附近和搭接区的硬度和弹性模量，并用MT--3型显微硬度计测试了多道熔覆层硬度的面分布。结果表明,稀土的加入细化了晶粒，减小了二次枝晶间距；近界面和搭接区的纳米硬度和弹性模量有不同程度的提高。硬度面分布测量结果表明，加入稀土后熔覆层的平均硬度(HV)约为500，比未加稀土的提高约50。本文还讨论了稀土作用的机理。
The morphologies of laser clad ferrite--based alloy coatings with different contents of rare earth (RE) were observed by SEM. The nanohardness and the elastic modulus of the near the surface and overlapping area were tested by nanoindentation. The hardness distribution in the coating was measured by microhardness tester. The experimental results show that the microstructure of the coatings with RE was refined, the spacing of second dendrites was reduced, and spacing the nanohardness and elastic modulus were increased. The average hardness (HV) of the coating with RE is about 500, which is 50 higher than that without RE. The mechanism of the RE effect was discussed.
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