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通过添加不同含量W粉制备高性能涂层,借助光学显微镜、硬度计以及磨粒磨损试验机等手段,对比研究了W含量对氩弧熔覆修复金属模具涂层组织与性能的影响。结果表明,W对涂层显微组织与性能有显著影响。随着W粉添加量的增加,涂层中奥氏体组织逐渐消失,初生碳化物M_(23)C_6含量增加。涂层硬度(HRC)值从52增加到62,而涂层耐磨性则表现为先增加后减小。其中当W粉添加量为5%时,初生碳化物M_(23)C_6均匀分布在涂层中,耐磨性最佳,其相对耐磨性比基体提高了22.5倍。
By adding different content of W powder to prepare high performance coatings, the effect of W content on the microstructure and properties of the metal mold coating by argon arc cladding was studied by means of optical microscope, hardness tester and abrasive wear tester. The results show that W has a significant effect on the microstructure and properties of coatings. With the addition of W powder, the austenite microstructure gradually disappeared and the content of primary M_ (23) C_6 increased. Coating hardness (HRC) value increased from 52 to 62, while the wear resistance of the coating showed the first increase and then decrease. Among them, when the addition amount of W powder is 5%, the primary carbides M 23 C 6 uniformly distribute in the coating, the wear resistance is the best, and the relative wear resistance is 22.5 times higher than that of the matrix.