摘要
采用激光熔覆快速凝固技术原位合成颗粒增强Cu-4.2Cr复合涂层。研究表明,激光扫描速度过低,涂层由于重力场作用存在严重的Cu、Cr分层现象。随扫描速度的提高,激光熔池冷却速度和过冷度提高,初生相Cr呈细小颗粒状弥散分布在Cu基体上,起到了显著的弥散强化效果。硬度结果表明,涂层经500℃时效后硬度最高达到170HV,与纯铜硬度相比提高1倍以上。
The particle reinforced Cu-4.2Cr composite coating was successfully in-situ prepared by laser cladding. The results show that the layer-separated structure may occurs if the laser scanning velocity is too low. With the increase of scanning velocity, the refined Cr-rich particle phase is successfully homogeneously distributed in the Cu matrix due to the rapid solidification rate and large undercooling. The microhardness of the coating reaches about 170 HV after aging at 500 ℃, the hardness is almost double than the microhardness of pure copper.
出处
《热加工工艺》
CSCD
北大核心
2013年第6期146-148,共3页
Hot Working Technology
关键词
激光熔覆
扫描速度
硬度
laser cladding
scanning velocity
microhardness
