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本文研究了高温镍基铸造合金ＨＨ３３上稀土含量对激光表面熔铸钻基合金涂层开裂敏感性的影响。结果表明，不加稀土时，基体中出现了微裂纹；稀土含量为０．５％Ｗｔ时，裂纹由基体向涂层扩展；稀土含量为２％Ｗｔ时，裂纹进一步扩展直至贯穿涂层。此时，裂纹的长度和宽度最大，裂纹周围的组织粗大；当稀土含量为３％Ｗｔ时，涂层及基体无裂纹出现，且涂层组织细小、均匀．涂层显微硬度值较未加稀土时低。
In this paper, the effect of rare earth content on the cracking susceptibility of laser surface alloying with diamond-based alloy coatings on high temperature nickel-base cast alloy HH33 was studied. The results show that the microcracks appear in the matrix without the addition of rare earth. When the content of rare earth is 0.5% Wt, the crack propagates from the matrix to the coating. When the content of rare earth is 2% Wt, the cracks further extend until the coating penetrates the coating. In this case, the crack length and width are the largest, and the structure around the crack is coarse. When the content of rare earth is 3% Wt, there is no crack in the coating and matrix, and the coating structure is small and uniform. The microhardness of the coating is lower than that without rare earth.