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在 TC4合金表面进行了激光熔覆 Ni Cr BSi涂层的试验 ,结果表明 ,激光熔覆层在微观结构上存在熔覆区、结合区和基体热影响区三个区域。熔覆区的组织是在初晶 γ Ni和 γ Ni、Ni3B、硅化物组成的多元共晶基底上分布着 Ti B2 、Ti C、M2 3( CB) 6等颗粒增强相。结合区是熔覆材料 Ni基合金和基体钛合金的混熔区 ,呈定向凝固特征。基体热影响区为针状马氏体组织。激光熔覆层的耐磨性能比时效硬化的钛合金显著提高 ,磨损机制是剥层磨损和磨粒磨损。
The experiment of laser cladding Ni Cr BSi coating on the surface of TC4 alloy shows that there are three regions of laser cladding layer on the microstructure, cladding zone, bonding zone and heat affected zone. The microstructure of the cladding zone is that TiB2, TiC, M2 3 (CB) 6 particles are distributed on the polycrystalline eutectic base composed of primary Ni, γ Ni, Ni3B and silicide. The bonding zone is the melting zone of the cladding material Ni-based alloy and the matrix titanium alloy, and has the directional solidification characteristics. Matrix heat affected zone acicular martensite. The wear resistance of the laser cladding layer is significantly higher than the age-hardened titanium alloy, the wear mechanism is the peeling layer wear and abrasive wear.