激光熔覆与高速火焰喷涂WC-CrC-Ni涂层的微观结构与摩擦学行为：对比评估

Microstructure and Tribo-Behavior of WC-CrC-Ni Coatings by Laser Cladding and HVAF Sprayed: A Comparative Assessment.

作者信息

Zhang Ziying, Li Weizhou, Yang Ruixia, Zhao Xiaolian, Zhang Houan

机构信息

School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China.

School of Materials Science and Engineering, Xiamen University of Technology, Xiamen 361024, China.

出版信息

Materials (Basel). 2023 Mar 11;16(6):2269. doi: 10.3390/ma16062269.

DOI:10.3390/ma16062269

PMID:36984149

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10057580/

Abstract

SK5 steel is the base material used for the preparation of the wrinkle scraper, whose service life strongly affects the working efficiency and economic benefits. In this work, WC-Cr3C2-Ni coating was deposited on the SK5 steel substrate by using High-velocity air fuel spray (HVAF) and Laser cladding (LC) processes respectively, named HVAF-WC coating and LC-WC coating. The microstructure and wear resistance of both coatings were analyzed, and were compared with the substrate sample. Results showed that the coatings were adhesive well onto the substrate. More WC with fine crystals is retained in HVAF-WC coating due to low flame flow temperature, while WC of LC-WC coating is characterized by columnar crystals. The wear rate of HVAF-WC and LC-WC coating was 4.00 × 10 mm/(N•m) and 3.47 × 10 mm/(N•m), respectively, which was two and one orders of magnitude lower than SK5 steel with 3.54 × 10 mm/Nm. HVAF-WC coating exhibited the best wear resistance because of significant fine grain strengthening, which wear mechanism is mainly dominated by abrasive wear. Thus, it was thought that HVAF-WC coating is more effective ways to improve the wear resistance of SK5 steel, comparing with LC-WC coating.

摘要

SK5钢是制备皱纹刮刀的基体材料，其使用寿命对工作效率和经济效益有很大影响。在本研究中，分别采用高速空气燃料喷涂（HVAF）和激光熔覆（LC）工艺在SK5钢基体上制备WC-Cr3C2-Ni涂层，即HVAF-WC涂层和LC-WC涂层。分析了两种涂层的微观结构和耐磨性，并与基体样品进行了比较。结果表明，涂层与基体结合良好。由于火焰流温度较低，HVAF-WC涂层中保留了更多的细晶WC，而LC-WC涂层中的WC则为柱状晶。HVAF-WC涂层和LC-WC涂层的磨损率分别为4.00×10⁻⁶mm³/(N•m)和3.47×10⁻⁶mm³/(N•m)，比磨损率为3.54×10⁻⁴mm³/Nm的SK5钢低两个和一个数量级。HVAF-WC涂层由于显著的细晶强化作用而表现出最佳的耐磨性，其磨损机制主要为磨粒磨损。因此，与LC-WC涂层相比，HVAF-WC涂层是提高SK5钢耐磨性更有效的方法。