TC4钛合金表面激光NiAl-VC复合合金化的试验研究  

Experiment study on TC4 alloy surface laser NiAl-VC composite alloying

作　　者：任博[1] 王维夫[1] 姚建华[1] 

机构地区：[1]浙江工业大学特种装备制造与先进加工技术教育部/浙江省重点实验室,浙江杭州310014

出　　处：《金属热处理》2013年第1期63-66,共4页Heat Treatment of Metals

摘　　要：为了改善钛合金表面性能,采用CO2激光器在钛合金表面进行了NiAl-VC复合合金化试验,分析了合金化层的组织结构和物相组成,测试了合金化层的显微硬度。结果表明,由于温度梯度和冷却速度的差异,合金化层的最表层、次表层与中下层呈现出不同的组织结构。合金化层与基体实现冶金结合,合金化层含有TiC、Al2NiTi3C、NiTi、Ti2Ni及Ti3Al多种增强相,使得其显微硬度达996 HV0.1,比基体有较大提高。In order to improve the titanium alloy surface properties,an experiment of laser NiAl-VC composite surface alloying on the titanium alloy by CO2 laser was carried out.The microstructure and phase composition of the alloyed layer were investigated,and the microhardness was measured.The results show that as temperature gradient and the cooling speed differences,the top surface,the subsurface and the lower layer present a significant differences microstructure in the whole alloyed layer.The metallurgical bonded interface between the alloyed layer and the substrate is achieved.The microhardness of the alloyed layer comes up to 996 HV0.1,higher than that of the substrate,which is enhanced by TiC,Al2NiTi3C,NiTi,Ti2Ni and Ti3Al strengthening phases in the alloyed layer.

关 键 词：钛合金 激光 合金化 显微组织 显微硬度 

分 类 号：TG178[金属学及工艺—金属表面处理]