文献类型：期刊文献

英文题名：Study on Secondary Remelting Modification of Laser Cladding Ni60/WC Composite Coatings

作者：Zhang, Jianwen[1];Wang, Gui[1,2];Wu, Jingquan[1,2];Huang, Jiang[3];Shi, Wenqing[4];An, Fenju[1];Wu, Xianglin[1,2]

机构：[1]Guangdong Ocean Univ, Sch Mech Engn, Zhanjiang 524088, Peoples R China;[2]Guangdong Engn Technol Res Ctr Ocean Equipment & M, Zhanjiang 524088, Peoples R China;[3]Guangdong Ocean Univ, Sch Elect & Informat Engn, Zhanjiang 524088, Peoples R China;[4]Guangdong Ocean Univ, Sch Mat Sci & Engn, Yangjiang 529500, Peoples R China

年份：2025

卷号：13

期号：5

外文期刊名：LUBRICANTS

收录：SCI-EXPANDED(收录号：WOS:001496759400001)、、WOS

基金：Supported by the National Natural Science Foundation Project (No. 62073089), the Zhanjiang Science and Technology Plan Project (No. 2021A05171), and the Laser Processing Team Project of Guangdong Ocean University (No. CCTD201823).

语种：英文

外文关键词：laser cladding; Ni60/WC; remelting; hardness

外文摘要：In this study, laser melting experiments of Ni60/WC composite powder coatings were carried out using a laser, and the surface morphology and microstructure of the coatings were analyzed using a scanning electron microscope (SEM) coupled with energy dispersive X-ray spectroscopy (EDS). In addition, hardness testing equipment was used to assess the hardness of the coatings and an electrochemical workstation was used to characterize their corrosion resistance. The key findings demonstrate substantial variations in coating performance based on remelting parameters. The coatings processed without secondary laser remelting exhibited an average hardness of 501.36 (standard deviation 154.46) HV0.2, a self-corrosion potential of -0.039 V, and a self-corrosion current density of 8.11 x 10-4 A/cm2. In contrast, some coatings were subjected to secondary remelting at 800 mm/min (S 800). The laser is used to scan the surface of the cladding with the laser on the surface of the cladding, and the speed is the feed rate of the laser scanning. XRD analysis revealed intensified main peaks, indicative of elevated solid solution and carbide content. SEM micrographs displayed fishbone-like and feather-like morphologies, with the hardness increasing to 622.98 (standard deviation 9.60) HV0.2 and the corrosion metrics improving to -0.038 V and 2.86 x 10-5 A/cm2. In contrast, coatings remelted at 600 mm/min (S600) exhibited broader but less intense XDR peaks, alongside diminished reticulation in SEM imagery. These samples demonstrated marginally lower hardness 599.91 (standard deviation 8.35) HV0.2 but superior corrosion resistance, with a self-corrosion potential of -0.012 V and current density of 2.64 x 10-5 A/cm2. The results underscore the critical influence of laser scanning velocity and remelting frequency on microstructural evolution, mechanical strength, and electrochemical stability. Enhanced hardness correlates with refined microstructural features, while enhanced corrosion resistance arises from reduced defect density and stabilized electrochemical activity.