Ni基合金基体激光熔覆Co基合金涂层的微观组织与性能

Microstructure and properties of Co-based alloy laser cladding on Ni-based alloy

利用CO_2激光热源在Inconel 600镍基合金基体上熔覆制备了纳米稀土Y_2O_3/Co-Cr-W系钴基合金涂层,并对涂层的组织及性能进行了分析。结果表明,Co基合金激光熔覆涂层由界面熔合区、柱状枝晶区及熔覆金属中心胞状区3个区域构成。稀土Y_2O_3/Co-Cr-W系钴基合金复合涂层距离表面2 mm左右显微硬度最高,为938.9 HV0.1,而Inconel 600基体显微硬度只有362.0 HV0.1。钴基合金涂层的耐磨性也大大高于基体组织,磨损40 min时磨损量为0.7 mg,只有基体组织的2.73%。

Rare earth oxide nano-Y_2O_3/ Co-Cr-W Co-based alloy coating was prepared on Inconel 600 Ni-based alloy by using CO2 laser.Microstructure and property of the coating were investigated. The results show that the laser cladding coating is consisted of a interface fusing zone,a columnar dendrite zone and a cellular crystal zone. The highest microhardness is 938. 9 HV0. 1 measured at the distance about 2 mm to the composite cladding surface of the Y_2O_3/ Co-Cr-W Co-based alloy coating,but the microhardness of the base metal is only 362. 0 HV0. 1.The wear resistance of the Co-based alloy coating is greatly higher than that of the base metal. The wear loss of the Co-based alloy coating is0. 7 mg,only 2. 73% compared with the base metal.