Wang Shanshan, Shi Wenqing, Cheng Cai, Liang Feilong, Li Kaiyue
School of Electronics and Information Engineer, Guangdong Ocean University, Zhanjiang 524088, China.
School of Materials Science and Engineering, Guangdong Ocean University, Yangjiang 529500, China.
Materials (Basel). 2023 Nov 7;16(22):7070. doi: 10.3390/ma16227070.
A Ni60+30%WC composite coating was prepared on the surface of Q235 steel by utilizing a high cooling rate, small thermal deformation of the substrate material, and the good metallurgical bonding characteristics of laser cladding technology. This paper focuses on the study of the composite coatings prepared under different process parameters in order to select the optimal process parameters and provide theoretical guidance for future practical applications. The macroscopic morphology and microstructure of t he composite coatings were investigated with the help of an optical microscope (OM) and a scanning electron microscope (SEM). The elemental distribution of the composite coatings was examined using an X-ray diffractometer. The microhardness and wear resistance of the composite coatings were tested using a microhardness tester, a friction tester, and a three-dimensional (3D) profilometer. The results of all the samples showed that the Ni60+30%WC composite coatings prepared at a laser power of 1600 W and a scanning speed of 10 mm/s were well formed, with a dense microstructure, and the microhardness is more than four times higher than the base material, the wear amount is less than 50% of the base material, and the wear resistance has been significantly improved. Therefore, the experimental results for the laser power of 1600 W and scanning speed of 10 mm/s are the optimal process parameters for the preparation of Ni60+30%WC.
利用激光熔覆技术冷却速度快、基体材料热变形小以及冶金结合良好的特点，在Q235钢表面制备了Ni60 + 30%WC复合涂层。本文着重研究不同工艺参数下制备的复合涂层，以选择最佳工艺参数，并为未来的实际应用提供理论指导。借助光学显微镜（OM）和扫描电子显微镜（SEM）研究了复合涂层的宏观形貌和微观结构。使用X射线衍射仪检测复合涂层的元素分布。使用显微硬度计、摩擦测试仪和三维（3D）轮廓仪测试复合涂层的显微硬度和耐磨性。所有样品的结果表明，在激光功率为1600 W、扫描速度为10 mm/s的条件下制备的Ni60 + 30%WC复合涂层成型良好，组织致密，显微硬度比基体材料高出四倍多，磨损量小于基体材料的50%，耐磨性得到显著提高。因此，激光功率为1600 W、扫描速度为10 mm/s的实验结果是制备Ni60 + 30%WC的最佳工艺参数。
