FV520B激光熔覆FeCr合金的性能分析  

Performance Analysis of Fe Cr Repaired Coating on FV520B Steel by Laser Cladding

作　　者：李法双 李方义[1,2] 贾秀杰[1,2] 金湖 王一凡[1,2] 

机构地区：[1]山东大学高效洁净机械制造教育部重点实验室 [2]山东大学

出　　处：《工具技术》2015年第10期55-58,共4页Tool Engineering

基　　金：国家重点基础研究发展计划资助项目(2011CB013403);国家高技术研究发展计划资助项目(2013AA040204)

摘　　要：FV520B是离心式压缩机叶轮的常用材料,叶轮服役过程中经常出现磨损、腐蚀等损伤形式。为了实现对损伤叶轮的再制造,在FV520B板材上激光熔覆Fe Cr合金粉末,并对激光熔覆层和FV520B基体进行了显微硬度实验测试、微观组织观察、耐腐蚀试验和抗摩擦磨损实验来分析激光熔覆前后材料的性能变化。实验结果表明:激光熔覆层的显微组织比FV520B基体更加均匀、致密,因此显微硬度更高。激光熔覆层和FV520B基体的显微硬度分别为620.37HV和366.6HV,激光熔覆层比FV520B基体硬度平均高1.7倍;通过极化曲线分析测得了激光熔覆层和FV520B基体的Tafel曲线,并用Tafel曲线外推法测试了熔覆层和基体的腐蚀速度;激光熔覆层的硬度比基体要高,在摩擦磨损试验中达到稳定磨合期的时间比FV520B基体要长且稳定摩擦因数比基体要高,熔覆层和基体的稳定摩擦系数分别为0.78和0.65。FV520B is often used in large centrifugal compressor impeller which often be damaged by wear、corrosion and other damage. In order to realize the remanufacture of impeller,the Fe Cr alloy is deposited on the FV520 B plate by laser cladding. Micro- hardness test 、microstructure observation、corrosion test and wear test are carried on FV520 B substrate and laser cladding. The results show that the microstructure of laser cladding is more close than FV520 B. Laser cladding layer is 1. 7 times higher than the hardness of substrate. FV520 B substrate is better than the laser cladding in the corrosion resistance by the analysis of polarization curve. Compared with FV520 B substrate,laser cladding will spend more time reach Stable period of friction and wear. The fraction factor of laser cladding is higher than FV520 B substrate.

关 键 词：激光熔覆 FV520B 耐磨性 硬度 耐腐蚀性 

分 类 号：TG142[一般工业技术—材料科学与工程]