摘要
用CO2激光在TC4合金表面熔覆TiC+Ti和TiC+NiCrBSi金属陶瓷涂层,分析了熔覆层的微观组织,测试了熔覆层的干滑动磨损性能。结果表明,在TiC+Ti激光熔覆层中,TiC颗粒全部溶解,熔覆层的组织是在βTi基体上分布着TiC树枝晶;在TiC+NiCrBSi激光熔覆层中,TiC颗粒部分溶解,熔覆层的组织是在γNi树枝晶和γNi+M23(CB)6共晶的基体上分布着细小的TiC颗粒和TiC树枝晶。TiC+Ti激光熔覆层的显微硬度在500～700HV之间,质量磨损率约为TC4合金的13;TiC+NiCrBSi激光熔覆层的显微硬度在900～1100HV之间,质量磨损率约为TC4合金的110。
Laser cladding of Ti-6Al-4V alloy with TiC+Ti and TiC+NiCrBSi powders was performed. The microstructure of the two types of laser clad layers was characterized using SEM and TEM, and the dry sliding wear property of the coatings was evaluated using pin-on-disc wear test machine. The results show that all TiC particles are dissolved to form a microstructure of TiC dendrites in β-Ti matrix in the clad layer for TiC+Ti laser clad coating. For TiC+NiCrBSi laser clad coating, parts of TiC particles are dissolved to form a microstructure of TiC particles and fine TiC dendrites in the matrix of γ-Ni dendrites and γ-Ni+M_ 23(CB)_6 eutectics in the clad layer. The microhardness of TiC+Ti laser clad layer is in a range of 500～700HV with the wear mass loss ratio being third of that of Ti-6Al-4V alloy. The microhardness of TiC+NiCrBSi laser clad layer is in a range of 900～1100HV with the wear mass loss ratio being an order of magnitude less than that of Ti-6Al-4V alloy.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2006年第1期96-99,共4页
Transactions of Materials and Heat Treatment
基金
天津市自然科学基金资助项目(043603211)
关键词
钛合金
激光熔覆
TiC金属陶瓷涂层
微观组织
耐磨性能
titanium alloys
laser cladding
TiC metal/ceramics coating
microstructure
wear resistance
