基底材料对NiCrBSiC合金激光熔覆层组织和磨损性能的影响  

Effects of Substrate Materials on Microstructure and Tribological Properties of NiCrBSiC Alloy Laser Clad Layer

作　　者：孙荣禄[1] 牛伟[1] 刘录录[1] 

机构地区：[1]天津工业大学机械电子学院,天津300160

出　　处：《材料工程》2006年第9期45-48,共4页Journal of Materials Engineering

基　　金：天津市自然科学基金资助项目(043603211);中国博士后科学基金资助项目(2003033349)

摘　　要：采用横流CO2激光在45钢和TC4钛合金表面熔覆NiCrBSiC合金涂层，利用XRD，SEM和TEM分析了激光熔覆层的微观组织，测试了激光熔覆层的硬度和摩擦磨损性能。结果表明，NiCrBSiC合金激光熔覆层的组织和性能与基底材料的种类密切相关。45钢表面激光熔覆层由γ-Ni，Ni3B，Cr7C8和CrB相组成，硬度在HV800～900之间；TC4合金表面激光熔覆层由γ-Ni，Ni3B，TiC和TiB2相组成，硬度在HV900～1100之间。TC4合金表面NiCrBSiC激光熔覆层的摩擦系数和质量磨损率分别低于45钢表面NiCrBSiC激光熔覆层的摩擦系数和质量磨损率。Laser cladding of NiCrBSiC powders on 45 steel and TC4 alloy substrates was carried out. The microstructure of the laser clad layers was characterized using XRD, SEM and TEM. The microhardness and tribological properties of the laser clad layers were examined. The results showed that the microstructure, microhardness and tribological properties of the laser clad layers were closely related to kinds of substrates materials. The microstructure of the laser clad layer on 45 steel sur face consisted of γ-Ni, Ni3B, Cr7C3 dendrites and CrB particles, and the microhardness of the laser clad layer was distributed within HV800-900. The microstructure of the laser clad layer on TC4 alloy surface consisted of γ- Ni, Nia B, TiC and TiB2 particles, and the microhardness of the laser clad layer was distributed within HV900-1100. The friction coefficient and mass loss rate of NiCrBSiC laser clad layer were lower on TC4 alloy than on 45 steel, respectively.

关 键 词：激光熔覆 NiCrBSiC合金 显微组织 摩擦磨损性能 

分 类 号：TG156.99[金属学及工艺—热处理]