钛合金表面激光重熔NiCrBSi+TiN涂层的组织研究  

Study on microstructure of laser remelted NiCrBSi+TiN coatings on surface of tianium alloy

作　　者：郭立新[1] 刘荣祥[1] 王亚明[1] 周玉[1] 雷廷权[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《材料热处理学报》2009年第2期134-137,共4页Transactions of Materials and Heat Treatment

摘　　要：对TC4合金喷涂NiCrBSi+20vol%TiN涂层进行激光重熔试验,利用SEM、TEM等手段对熔覆层的组织进行了分析。结果表明,激光重熔层组织消除了喷涂层的组织缺陷,其相组成为(Cr-Ni-Fe),TiNi,NiB,Cr2Ti,Ti2Ni等,在熔覆区主要以富铬相和富镍相为主,稀释区内的黑色和白色衬度的杆状组织是Ti2Ni型的金属间化合物。Laser remehing of thermal spray coating of NiCrBSi ＋ TiN powders on surface of TC4 alloy was performed, and its microstructure was studied by means of SEM and TEM. The experimental results show that macroscopic defects in the thermal spray coatings are eliminated after laser remelting. The phases of the coatings are composed of （Cr-Ni-Fe）, TiNi, NiB, Cr2Ti, Ti2Ni. Cr-rich phase and Ni-rich phase are dominant in the clad zone, and the rod-like phase in the dilution zone is Ti2 Ni-type intermetallics.

关 键 词：激光重熔 钛合金 显微组织 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TN249[金属学及工艺—金属学]