钛合金表面激光熔覆TiN-Ni基合金复合涂层的组织和磨损性能  

Microstructure and Wear Resistance of TiN-NiCrBSi Laser Clad Layer on Titanium Alloy Surface

作　　者：孙荣禄[1] 牛伟[1] 王成扬[2] 

机构地区：[1]天津工业大学,天津300160 [2]天津大学,天津300072

出　　处：《稀有金属材料与工程》2007年第1期7-10,共4页Rare Metal Materials and Engineering

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

摘　　要：以TiN和NiCrBSi合金混合粉末为原料,采用激光熔覆技术在TC4合金表面制备出TiN颗粒增强Ni基合金涂层。利用XRD,SEM和TEM等分析了激光熔覆层的相组成及微观组织,并测试了激光熔覆层的显微硬度和磨损性能。结果表明,激光熔覆层由熔覆区和稀释区2个区域组成,熔覆区的组织是在γ-Ni树枝晶和γ-Ni+Ni3B层片状共晶的基体上均匀地分布着TiN颗粒和针状M23C6相,显微硬度在9000MPa^12000MPa之间。稀释区为基底TC4合金和熔覆材料Ni基合金的混合凝固区,呈胞状晶和树枝晶形态。激光熔覆层中存在颗粒强化、细晶强化和固溶强化等多种强化作用,大幅度地提高了TC4合金的耐磨性能。Ni based clad layer reinforced with TiN particles was prepared on the surface of TC4 alloy adpting laser cladding process, using the mixed powder of TiN powder and NiCrBSi powder as starting material. The microstructure of the laser clad layer was characterized by XRD, SEM and TEM. The microhardness and wear resistance of the laser clad layer were examined. The results show that the laser clad layer is divided into two zones： the clad and dilution zones. In the clad zone, TiN particles and M23C6 are distributed in matrix of the γ-Ni dendrites and the eutectics consisting of γ-Ni and Ni3B, and the microhardness is 9000 MPa-12 000 MFa. The dilution zone is a mixture of Ti-6Al-4V alloy and Ni-base alloy, and presents a microstructure of dendrites and cells. The clad layer is reinforced by particles, solution, and grain-refining, resulting in a remarkable increase in wear resistance comparing with Ti-6Al-4V alloy.

关 键 词：钛合金 激光熔覆 显微组织 磨损性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]