激光熔覆制备原位自生增强颗粒复合涂层  

Study on In-Situ formation of Particle Reinforced Coating Produced by Laser Cladding

作　　者：齐勇田[1] 刘世玺[1] 曹朝霞[1] 

机构地区：[1]包头职业技术学院,内蒙古包头014030

出　　处：《应用激光》2014年第2期105-108,共4页Applied Laser

基　　金：内蒙古高校包头职业技术学院科研资助项目(项目编号:Y201301)

摘　　要：采用高能束横流HL-5000型CO2激光器在铸钢表面熔覆了含有碳氮化钛增强粒子的铁基熔覆层。利用X射线衍射（XRD）和能谱EDAX对熔覆层进行了分析，并采用光学显微硬度计对熔覆层的硬度进行了测试。利用金相显微镜（0M）和扫描电镜（SEM）对激光熔覆层的微观组织进行了研究。结果表明Ti（C0.3N0.7）可以通过原位反应合成，新的颗粒状强化相Ti（C0.3 sN0.7）的形貌特征多呈不规则形状，弥散分布在熔覆层基体中。熔覆层与母材形成良好的冶金结合，熔覆层内为方向性强的胞状树枝晶，晶粒细小。熔覆层的显微硬度HV0．3达到730-850。Fe-based alloy composite coating has been produced on the surface of cast steel through COzlaser cladding technolo-gy. Ceramic particle reinforced phase has been in-situ synthesized. Component of the layer was studied by XRD phase and EX-AD, the microhardness of the layer was measured by using microhardness meter. The microstructure of the composite claddinglayer is analyzed by means of optical microscopy （OM） and scan electron microscopy （SEM）. The results show the new particlenamed Ti （C0.3 N0.7 ） particle is introduced by an irrsitu synthesis reaction during laser cladding process. The shape ofTi（C0.3 N0.7 ） particle is irregular, and they are dispersed evenly in the matrix. There is a fine combine interface between lasercladding layer and matrix. The substrate of laser cladding layer is fine dendrites and cell crystal. The microhardness of lasercladding layer is distributed within HV0.3 730-850.

关 键 词：激光熔覆 原位自生 碳氮化钛 颗粒增强 

分 类 号：TG156.99[金属学及工艺—热处理]