以Fe-B-Si三元合金为母合金,分别采用球磨破碎和甩带研磨两种方式制备了晶态和非晶态复合粉末并在45钢表面上进行了激光熔覆试验。通过对粉末物相结构和熔覆层质量、结构、组织及性能分析可知：在相同的熔覆能量条件下,非晶复合粉末的熔覆性能优于晶态粉末。采用非晶复合粉末所获得的熔覆层表面及内部没有气孔和裂纹,与基体形成了良好的冶金结合,其组织为细小均匀的树枝晶,各元素在熔覆层内分布较为均匀,受固溶强化、位错强化和细晶强化的影响,其硬度及耐磨性与基体相比都有较为明显的改善。
Laser cladding of crystalline and amorphous composite powders which were prepared by ball milling broken method and grinding spinning ribbon method, respectively, from the master alloy Fe-B-Si was conducted on surface of 45 steel. Phases of the powders, and microstructure and properties of the clad layer were analyzed. The results show that the cladding performamce of the amorphous composite powder is superior to that of the crystalline composite powder under the same cladding energy condition. No porosity and cracks on the surface and inside of the cladding layer acquired from amorphous composite powder are observed. This cladding layer exhibits excellent metallurgical bonding with substrate and its microstructure consists of fine dendrites with homogeneous distribution of elements inside the cladding layer. The hardness and wearing property of the cladding layer is much better than that of substrate metal because of solid solution strengthening, dislocation and fine-grain strengthening.
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