Ti-TiC激光熔覆层的形成及其表征  

Ti-TiC laser cladding layer formation and its characteristics

作　　者：李长青[1] 武万良[1] 王树成[1] 徐成彦[2] 

机构地区：[1]黑龙江科技学院材料科学与工程学院,哈尔滨150027 [2]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《黑龙江科技学院学报》2010年第4期272-276,共5页Journal of Heilongjiang Institute of Science and Technology

基　　金：黑龙江省教育厅科学技术研究项目(11513099)

摘　　要：为分析激光熔覆法制备TiC/Ti复合材料显微形貌的成因,对功率密度为21.2 kW/cm2、扫描速度15mm/s的CO2激光作用下的Ti-6A l-4V合金表面进行了Ti+TiC激光熔覆实验,并对其熔覆层温度波动进行了分析。采用XRD、SEM对Ti+TiC熔覆层进行表征,并测定熔覆层的显微维氏硬度。分析表明:用激光熔覆制备TiC/Ti复合材料时,熔覆层在数毫秒内熔化,并以约104℃/s速率初始冷却。熔覆层的维氏硬度高达10.8 GPa,Ti填充杂乱的TiC枝晶间。熔覆层与基体具有良好的冶金结合,且热影响区厚度与经验计算值相近。Aimed at analyzing the formation of microstructure of Ti ＋ TiC mixture prepared by laser cladding, this paper describes Ti ＋ TiC laser cladding experiment on Ti -6A1 -4V（ mass ratio）alloy sur- face subjected to C02 laser with 21.2 kW/cm2 power density and 15 mm/s scanning velocity and an anal- ysis of the temperature variation of cladding layer. The paper introduces the characterization of the Ti ＋ TiC clad layer by using XRD, SEM and the determination of microstructure and micro-hardness of cladding layer. The results shows that： in the case of TiC/Ti composite materials in cladding layer synthesized by Ti ＋ TiC mixture, the mixture is found to melt in several microseconds, and cool down in 104 ℃/s. In clad layer, its micro hardness is up to 10.8 GPa, and Ti fills up TiC dendrite. Cladding layer has a better metallurgical bonding with Ti -6A1-4V alloy matrix, and the depth of heat affected zone is close to empirical calculating value.

关 键 词：钛合金 复合层 激光熔覆 Ti—TiC复合粉末 

分 类 号：TG156.99[金属学及工艺—热处理]