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对45钢表面激光熔覆Ni基纳米WC/Co复合涂层的断裂韧性Kc进行了研究。结果表明:激光熔覆Ni基纳米复合涂层的Kc≥18.0MN.m-3/2,而喷焊Ni基WC/Co复合涂层的Kc平均值为8.1 MN.m-3/2(最低值为4.4 MN.m-3/2)。分析认为:在本研究条件下,激光熔覆Ni基纳米WC/Co复合涂层中形成的呈三维网络结构分布的碳化物相及呈弥散分布的超细碳化物相的综合增强作用是该涂层断裂韧性Kc比常规喷焊同样材料(非纳米)涂层的Kc明显提高的主要原因。
The fracture toughness Kc of Ni-based nano-WC / Co composite coatings on 45 steel was investigated. The results show that the Kc of laser cladding Ni-based nanocomposite coatings is greater than or equal to 18.0MN.m-3/2, while the average Kc of spray-bonded Ni-based WC / Co composite coatings is 8.1 MN.m-3/2 Value of 4.4 MN.m-3/2). The analysis shows that under the conditions of this study, the comprehensive enhancement of the carbide phase with three-dimensional network structure and the ultrafine carbide phase with dispersed distribution formed in the laser cladding Ni-based nano WC / Co composite coating is that the coating The main reason for the significantly increased Kc of the layer fracture toughness Kc over the same material (non-nano) coating of conventional spray-on coatings.