球墨铸铁表面激光熔覆Fe-Cr-Si-B涂层  

Fe-Cr-Si-B coating by laser cladding on nodular cast iron

作　　者：张静[1,2] 刘继常[1,3] 张福全[2] 鄢锉[1] 杨柳杉[1,2] 倪立斌[1] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082 [2]湖南大学材料科学与工程学院,湖南长沙410082 [3]湖南长沙中南大学粉末冶金国家重点实验室,湖南长沙410082

出　　处：《材料热处理学报》2010年第5期133-137,共5页Transactions of Materials and Heat Treatment

基　　金：国家科技支撑计划重点项目(2007BAF29B01);教育部新世纪优秀人才支持计划(NCET-08-0183);中国博士后科学基金(20060390879)

摘　　要：在球墨铸铁QT600-3表面激光熔覆铁基合金涂层,分析测试了激光熔覆层的微观组织、显微硬度以及界面处Fe、Cr元素的分布情况。结果表明:激光熔覆区为胞状晶和树枝晶结构,组织均匀致密,Fe、Cr等元素在熔覆层与母材间发生了相互扩散,形成良好的冶金结合,并有硬质点的弥散分布,使得涂层硬度大幅度提高,大约为基体硬度的2.6倍。Iron-based alloy coating was prepared by laser cladding on surface of nodular cast iron QT600-3. Microstructure, microhardness of the coating and distribution of element Fe and Cr at interface between the coating and substrate were examined by means of optical microscope, SEM, XRD and hardness test. The results show that the microstructure of the laser clad coating consisted of cellular crystal layer and dendrite layer is homogeneous and free of pore. The inter-diffusion of elements Fe and Cr in the coating and substrate near interface is detected, indicating that metallurgically bonding forms between the coating and the substrate. The hardness of the coating increases 2.6 times compared with that of substrate due to dispersion hardening of carbides in the coating.

关 键 词：球墨铸铁 激光熔覆 铁基合金涂层 微观组织 显微硬度 

分 类 号：TG143.5[一般工业技术—材料科学与工程] TG164.2[金属学及工艺—金属材料]