In this study, The WC-Ni composite powders were fabricated by the electroless plating of nickel-phosphorus, followed by the appliance of the obtained particles as a coating on an AISI 321 steel by laser cladding method. Effects of main laser parameters, including power, scanning speed, and powder feed rate on the geometric properties were reviewed. The optimum single-pass specimen was chosen after considering the geometrical shape, dilution, and crack and porosity amount of the single-pass specimens. It was found that the increase in laser power and powder feed rate results in the rise of the height and the width of the coatings. In contrast, coatings with lower height and width were achieved by employing lower laser power and powder feed rates. The procedure was followed by the laser cladding of the WC-Ni powders on 321 steel substrate under the optimum coating parameters with a variety of overlap amounts; 30, 50, and 70 percent. By investigating the formed phases and microstructure of the overlap specimens, the 70 percent overlap coating was chosen as the optimal one. Mechanical and wear tests were conducted on the optimal overlap specimen. Experiments indicated that the hardness, elasticity modulus, and fracture toughness of the coating were, respectively, 1457 Vickers, 6.24 Mpa.m^1/2, and 250 GPa. The micro-hardness of the WC-Ni coating was 1.2–1.6 times higher than the WC-Ni, WC-Co and WC-Co-Ni coatings, made by thermal spray coating. Also, the toughness of the coating was 1.5 times higher than the WC-Co thermal sprayed coat. The elasticity modulus of the WC-Ni coating (250 GPa) was 1.1 times more than the WC-Co coating manufactured with the laser cladding method.

在这项研究中，通过化学镀镍-磷，然后通过激光熔覆法将获得的颗粒作为涂层涂覆在AISI 321钢上，制造了WC-Ni复合粉末。审查了主要激光参数，包括功率，扫描速度和送粉速度对几何性能的影响。在考虑了单次通过试样的几何形状，稀释度以及裂纹和孔隙率后，选择了最佳的一次通过试样。已经发现，激光功率和粉末进料速率的增加导致涂层的高度和宽度的增加。相反，通过使用较低的激光功率和粉末进料速率可获得具有较低高度和宽度的涂层。在此过程之后，在具有各种重叠量的最佳涂层参数下，在321钢基材上激光熔覆WC-Ni粉。30％，50％和70％。通过研究重叠试样的形成相和微观结构，选择70％重叠涂层作为最佳涂层。在最佳重叠试样上进行了机械和磨损测试。实验表明，涂层的硬度，弹性模量和断裂韧性分别为1457维氏，6.24 Mpa.m^1/2和250 GPa。WC-Ni涂层的显微硬度比热喷涂涂层制成的WC-Ni，WC-Co和WC-Co-Ni涂层高1.2-1.6倍。另外，涂层的韧性是WC-Co热喷涂涂层的1.5倍。WC-Ni涂层（250 GPa）的弹性模量是用激光熔覆法制造的WC-Co涂层的1.1倍。