球墨铸铁表面复合碳化物激光合金化层组织与性能研究  

Research on microstructure and performance of complex carbides laser alloyed coating on surface of ductile cast iron

作　　者：吴宇[1,2] 王文焱[1,2] 王沛[1,2] 谢丰豪[1,2] 张航宇[1,2] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]河南省有色金属材料科学与加工技术重点实验室

出　　处：《矿山机械》2010年第22期54-57,共4页Mining & Processing Equipment

基　　金：河南省基础与前沿技术研究计划项目(D923DD41DD49);河南科技大学大学生研究训练计划(2009008)

摘　　要：试验涂层材料采用亚微米级TiC和铬的复合碳化物作为强化硬质相,Fe-Cr合金作为基础粘结相,并加入质量分数为20%的Si元素,运用激光合金化技术,在球墨铸铁表面制备出高硬度的合金化层。通过扫描电镜,能谱分析、X光物相分析及显微硬度测定,对激光表面合金化层的显微组织及合金元素的分布进行了研究。试验结果表明,合金化层与基体实现了冶金结合,并形成了以莱氏体与马氏体为主的显微组织,激光合金化层中的细晶强化和固溶强化等强化作用使球铁表面的显微硬度得到了显著提高。Submicron Tic and complex carbides of Cr were used as hardening phase in the coating,and Fe-Cr alloy added with Si（wt%=20） as base phase.The laser alloying technology was applied to prepare high hardness alloyed layer on the surface of the ductile cast iron.The microstructure of laser alloyed coating and the distribution of alloying elements in laser alloyed coating were analyzed through observation of SEM,EDS,XRD and micro-hardometer.The experimental results revealed that the alloyed coating melted into the base metal and the layer made from martensite and ledeburite was generated.The microhardness of the surface of the ductile cast iron was reinforced due to grain refining strengthening and solid solution strengthening in laser alloyed coating.

关 键 词：激光合金化 显微组织 显微硬度 

分 类 号：TG174.44[金属学及工艺—金属表面处理]