铸钢轧辊电火花沉积YG8涂层的组织结构和性能  

Microstructure and properties of the YG8 ESD coating on a cast steel roll

作　　者：王建升[1] 孟惠民[1] 樊自栓[1] 俞宏英[1] 孙冬柏[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《北京科技大学学报》2009年第9期1152-1156,1163,共6页Journal of University of Science and Technology Beijing

基　　金：科技部国际科技合作项目(No.2006DFA52240)

摘　　要：采用新型电火花沉积设备,把YG8电极材料沉积在铸钢轧辊材料上,制备了WC沉积涂层,研究了其微观组织及耐磨性能.结果表明:沉积层主要由Fe3W3C、Co3W3C、W2C和Fe7W6C等相组成;沉积层与基体冶金结合,具有纳米颗粒尺寸的Fe7W6、W2C等硬质相弥散分布于沉积层中;沉积层的平均硬度为1 331 HV;沉积层较铸钢轧辊的磨损性能提高了2.3倍;沉积层的磨损机理以疲劳磨损为主,细小的弥散分布的硬质相是沉积层硬度及耐磨性提高的主要因素.The YG8 electrode was deposited on the surface of a cast steel roll by electro-sparking deposition（ESD） and formed a WC coating.The microstructure and wear resistance of the coating were investigated.The results show that the coating consists of Fe3W3C,Co3W3C,W2C and Fe7W6 phases,and is metallurgically bonded with the cast steel roll substrate.The Fe7W6 and W2C hard phases dispersedly distributed in the coating with nanosized particles.The average hardness of the coating is 1 331 HV.The coating has improved resistance performance which is 2.3 times higher than the cast steel substrate. The wear mechanism is mainly fa-tigue wear. Fine hard phases distributed in the coating dispersedly are the main factors leading to the high hardness and wear resistance of the coating.

关 键 词：电火花沉积 涂层 轧辊 微观结构 耐磨性 

分 类 号：TG178[金属学及工艺—金属表面处理]