TC4合金表面TiN陶瓷激光熔覆层的组织和耐磨性能  

Microstructure and wear resistance of laser clad layer of TiN on TC4 alloy

作　　者：孙荣禄[1] 雷贻文[1] 

机构地区：[1]天津工业大学机械电子学院,天津300160

出　　处：《天津工业大学学报》2007年第4期57-59,共3页Journal of Tiangong University

基　　金：天津市自然科学基金资助项目(043603211);天津市高等学校科技发展基金项目(060912)

摘　　要：为提高TC4合金的耐磨性能，采用连续波CO2激光在其表面熔覆TiN陶瓷涂层，分析了熔覆层的微观组织结构，对熔覆层的硬度和磨损性能进行了测试．结果表明，TiN激光熔覆层分为两个亚层，表层为TiN熔凝层，由TiN棒状树枝晶组成，底层为TiN和钛合金混凝层，由TiN棒状树枝晶、TiN颗粒和钛合金马氏体组成；TiN激光熔覆层的显微硬度在500—900HV之间，明显地改善了TC4合金的磨损性能．TiN cermets layers are clad on the surface of the TC4 alloys by continuous CO2 laser to improve their wear resistant property. The microstructure of the clad layers is analyzed, and its hardness and wear resistant properties are measured. The results show that the TiN laser clad layer is divided into two sub-regions, which the surface part is TiN melting-solidification zone with TiN stick-like dendrites and the bottom part is TiN ＋ Ti zone with TiN stick-like dendrites, TiN particles and Ti martensite. The microhardness of the laser clad layer is 500 - 900 HV, and the layer enhances the wear resistant property of TCA alloy greatly.

关 键 词：激光熔覆 TiN陶瓷涂层 微观组织 硬度 磨损性能 

分 类 号：TG156.99[金属学及工艺—热处理]