激光熔覆原位生成Ti(C_(0.3)N_(0.7))颗粒增强镍基复合熔覆层  

Investigation of In-situ Formed Ti(C、N) Particle Reinforced Ni-based Alloy Composite Coatings by Laser Cladding

作　　者：齐勇田[1] 施瀚超[1] 

机构地区：[1]山东大学材料科学与工程学院,山东济南250061

出　　处：《应用激光》2008年第2期135-138,共4页Applied Laser

摘　　要：激光熔覆技术是金属材料表面强化和改性的有效方法之一。利用横流式CO2连续激光器,在半钢轧辊表面上用预置涂层的方式,制备出了含有Ti(C、N)增强粒子的镍基熔覆层。然后用光镜、X射线衍射、扫描电镜、电子探针等手段对复合熔覆层中显微组织特征进行了分析,并采用光学显微硬度计对复合熔覆层的显微硬度进行了测试与分析。结果表明:TiN颗粒和石墨粉在激光熔覆过程中发生了化合反应,生成了新的颗粒状强化相Ti(C0.3N0.7)。在熔覆层中,Ti(C0.3N0.7)的形貌特征多呈不规则形状,大小在0.1-5.0μm之间。激光熔覆原位生成Ti(C0.3N0.7)颗粒增强镍基复合涂层的显微硬度达到800-900HV0.2。Laser cladding is the one of the important methods for the surface and modifying of metal material. Ni-based alloy composite coating reinforced by Ti （C,N） particle was fabricated on the substrate Adamite steel through laser cladding technol ogy. The microstructure of laser cladding layer is analyzed by means of OM, XRD, SEM and EPMA. The results show that Ti （C0.3 N0.7 ） particle is formed during laser cladding process. Size of the Ti （C,N） particle is within 0.1 -5μm. Ti （C,N） particle dispersed evenly in the matrix is similar to irregular shape. The microhardness of laser cladding layer is distributed within 800-900 HV0.2.

关 键 词：激光熔覆 原位反应 碳氮化钛 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG174.442[金属学及工艺—金属学]