摘要
采用高频感应熔覆方法在Q235低碳钢基体上制备了不同含量的WC增强Ni60A合金复合涂层。利用SEM和XRD分析了涂层的显微组织和相结构，并进行了耐磨性试验。结果表明，复合涂层中主要由WC、W2C、Cr7C3、Cr23C6、Cr2B、Ni2B、Ni3Si及Ni3Fe等相组成，并与基体实现了冶金结合。在相同试验条件下，涂层的硬度和耐磨性随WC含量的增加而提高，加入WC涂层的相对耐磨性为Ni60A涂层的2～6倍，当WC加入量为50％时涂层的耐磨性最好，为Ni60A涂层的6．5倍。涂层的磨损机制主要为轻微的塑性切削和硬质相的脆性剥落。
The tungsten carbide （WC） reinforced Ni60A alloy composite coatings on Q235 mild steel were produced by high frequency induction cladding. The microstructure, phases and worn surface of the coatings were examined by means of scanning electron microscopy （SEM） and X-ray diffraction （XRD）. Abrasive wear resistance was tested on a MLS-225 wet sand/rubber wheel tester. The results show that the composite coating mainly consists of WC, W2 C, Cr7 C3, Cr23 C6, Cr2 B, Ni2 B, Ni3 Si and Ni3 Fe. The composite coating is metallurgically bonded to the substrate. The hardness and abrasive wear resistance of the coatings increase with addition of WC content. Addition of WC particles improves wear resistance of coating 2 ～ 6 fold compared to that of Ni60A coating. The coating with 50% WC shows the best abrasive wear resistance and about 6.5 times higher than Ni60A coating was observed under same condition. Predominant wear mechanism of the coating is brittle peeling of hard phases and less microploughing.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2008年第3期138-141,共4页
Transactions of Materials and Heat Treatment
基金
北京市属市管高等学校人才强教计划资助项目
关键词
高频感应熔覆
碳化钨
NI基合金
复合涂层
high frequency induction cladding
WC
Ni-based alloy
composite coating
