论文部分内容阅读
使用2kw连续波CO_2激光器在45°钢表面进行激光熔敷Ni合金中添加50wt％Ni+Cr包及的Cr_3C_2复合粉的复合涂层,并对激光熔敷层的晶体生长形态、物相和硬度进行了分析。结果表明:熔敷层由下至上可分为平面前沿生长区,胞状晶区及枝晶:熔敷区的近表层由高度细小的奥氏体枝晶和C_7C_3、Cr_3C_2等化合物组成,熔敷层的硬度平均高达HV_(0.2)950—1200。添加Cr_3C_2粒子的激光熔敷层的显微硬度比镍基合金的显微硬度平均提高了HV_(0.2)300。
A 2kw continuous wave CO_2 laser was used to laser cladding Ni alloy with 50wt% Ni + Cr coating and Cr_3C_2 composite coating on the surface of 45 ° steel. The crystal growth morphology, phase and hardness Analyzed. The results show that the cladding layer can be divided into planar frontier growth zone, cellular zone and dendrite from bottom to top: the near surface of the cladding zone consists of highly-fine austenite dendrite and C_7C_3, Cr_3C_2 and other compounds, The average hardness of HV_ (0.2) 950-1200. The microhardness of the laser cladding layer added with Cr_3C_2 particles increased HV_ (0.2) 300 more than the microhardness of the nickel base alloy.