Using the principle of in-situ generation, tungsten carbide particles were generated in-situ on 40Cr surfaces pre-coated with self-made powders by TIG arc with flux-cored wires, and the in-situ generation process of hard phases such as WC/W2C was systematically investigated. The macroscopic morphology and microstructure of the cladding layers were analyzed using optical microscopy (OM), scanning electron microscopy (SEM), energy spectrometry (EDS), and X-ray diffractometry (XRD), and the hardness and wear resistance of the cladding layer were tested. The results show that the in-situ grown WC exhibits a positive triangular shape in the two-dimensional plane. No defects such as porosity and cracks are seen in the cladding layer, and the hard phase mainly consists of WC/W2C, as well as carbides with three typical morphologies of dendrites, rods, and ring-block. With the combined effect of residual tungsten carbide particles and in-situ grown hard phase, the optimal hardness and wear volume of the cladding layer were 664.4 HV1 and 0.33 mm3, respectively, which were increased to about 3 and 45 times that of the substrate.

中文翻译：

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TIG 电弧制备的 Ni-WC/W2C 熔覆层中硬相的原位生成以及微观结构和机械性能的研究


利用原位生成原理，通过带有磁芯焊丝的 TIG 电弧在预涂有自制粉末的 40Cr 表面上原位生成碳化钨颗粒，并系统研究了 WC/W2C 等硬相的原位生成过程。采用光学显微镜 （OM）、扫描电子显微镜 （SEM）、能谱 （EDS） 和 X 射线衍射法 （XRD） 分析了熔覆层的宏观形貌和微观结构，并测试了熔覆层的硬度和耐磨性。结果表明，原位生长的 WC 在二维平面上表现出正三角形。熔覆层未见气孔和裂纹等缺陷，硬质相主要由 WC/W2C 以及具有枝晶、棒状和环块三种典型形态的碳化物组成。在残余碳化钨颗粒和原位生长硬质相的共同作用下，熔覆层的最佳硬度和磨损体积分别为 664.4 HV1 和 0.33 mm3，分别提高到基体的 3 倍和 45 倍左右。