蠕墨铸铁激光熔覆镍基WC合金涂层的性能研究  

Properties Study of Laser Cladding Nickel-based WC Alloy Coating on Vermicular Graphite Iron

作　　者：刘宇平 谢金蕾 江国业[1] LIU Yuping;XIE Jinlei;JIANG Guoye(Airport College,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学机场学院,天津300300

出　　处：《热加工工艺》2021年第6期93-97,101,共6页Hot Working Technology

基　　金：国家自然科学基金项目(U1633111);天津市研究生科研创新项目(YJSS070)。

摘　　要：为研究蠕墨铸铁表面激光镍基/WC复合涂层的性能,利用SEM、EDS、摩擦磨损测试分析了激光功率、高温处理对熔覆层横截面微观组织、显微硬度、耐磨性的影响;考察了稀土元素对熔覆层裂纹的改善作用。结果表明:在其他激光参数不变的情况下,激光功率较小时熔覆层质量、硬度与耐磨性更好;加入稀土氧化物CeO2粉末能有效改善熔覆层中裂纹的产生;适当的高温热处理能提升熔覆层性能。在本实验条件下,熔覆层所能承受最高温度为800℃,超过该温度,熔覆层质量与硬度均有所下降。通过调控工艺参数和添加稀土元素,会改善熔覆层的质量与性能。In order to study the performance of laser nickel-based/WC composite coating on the surface of vermicular graphite cast iron, the effects of laser power and high temperature treatment on the cross-sectional microstructure,microhardness and wear resistance of the cladding layer were analyzed by SEM, EDS and friction and wear testing. The improvement effects of rare earth elements on the cracks of the cladding layer were investigated. The results show that when other laser parameters remain unchanged, the quality, hardness and wear resistance of the cladding layer are better when the laser power is low;adding rare earth oxide CeO2 powder can effectively improve the generation of cracks in the cladding layer;appropriate high temperature heat treatment can improve the performance of the cladding layer. Under the experimental condition, the maximum temperature that the cladding layer can withstand is 800 ℃. Above this temperature, the quality and hardness of the cladding layer reduce. By adjusting the process parameters and adding rare earth elements, the quality and performance of the cladding layer improve.

关 键 词：激光熔覆 稀土元素 耐磨性 高温热处理 

分 类 号：TG17[金属学及工艺—金属表面处理]