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为了提高矿山机械零部件的耐磨性能及使用性能,采用激光熔覆方法在45#钢基体上制备了Ni基合金与WC混合粉末的复合涂层,研究了熔覆层的物相组成、WC颗粒在Ni基合金涂层中的分布,以及加入50%WC颗粒后Ni基合金涂层的裂纹敏感性、显微组织、成分及硬度。结果表明,合理的工艺参数使WC颗粒分布均匀,与基体结合牢固,并保持原始的形状;熔覆层内没有裂纹产生;熔覆层与基体之间形成了冶金结合;熔合线附近由亚共晶组织(初晶的富Ni奥氏体γ-Ni与共晶组织)构成;熔覆层中上部由过共晶组织(初晶的碳化钨与共晶组织)构成,初晶碳化钨的形态有珊瑚状、等轴晶状、柱状及交互结晶状等;激光熔覆层硬度是45#钢基体的5倍以上。
In order to improve the wear resistance and serviceability of mining machinery parts, the composite coating of Ni-based alloy and WC mixed powder was prepared by laser cladding on 45 # steel substrate. The phase composition of the coating, WC Particle distribution in the Ni-based alloy coating, and crack sensitivity, microstructure, composition and hardness of the Ni-based alloy coating after addition of 50% WC particles. The results show that the reasonable process parameters make the WC particles distribute evenly, bond with the matrix firmly and maintain the original shape; there is no crack in the cladding layer; the metallurgical bond is formed between the cladding layer and the matrix; (Primary Ni-rich austenite γ-Ni and eutectic structure); the upper cladding layer by the hypereutectic structure (primary crystal tungsten carbide and eutectic structure), the morphology of primary crystal coral Shape, equiaxed crystal, columnar and interactive crystallization; laser cladding hardness is 5 times more than 45 # steel substrate.