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针对直升飞机发动机涡轮叶片采用连续激光熔覆出现裂纹及叶片变形的问题,在5 kW连续横流CO_2激光器上,采用新的电源控制方案,通过软件及相关控制,实现了脉冲激光功率输出。克服了采用高功率开关电源带来的成本和稳定性问题,且脉冲调制频率可达到5 Hz,调制占空比可达到5%～100%。当采用4 kW峰值功率,4 Hz脉冲重复频率,占空比为20%时,在发动机叶片K403合金表面进行合金粉末Stellite X-40的熔覆实验。结果表明,熔覆后热影响区比连续激光减少50%,硬度提高5%,界面结合性能与母材相当,无熔覆裂纹及叶片变形。
In order to solve the problem of crack and blade deformation caused by continuous laser cladding in turbine blades of helicopter, a new power control scheme was adopted on a 5 kW continuous cross-flow CO 2 laser, and the pulse laser power output was realized through software and related control. Overcoming the problems of cost and stability brought by adopting high-power switching power supply, the pulse modulation frequency can reach 5 Hz and the modulation duty cycle can reach 5% to 100%. When 4 kW peak power, 4 Hz pulse repetition frequency and 20% duty cycle were used, the cladding experiment of alloy powder Stellite X-40 was performed on the K403 alloy. The results show that the heat affected zone after laser cladding is reduced by 50% and the hardness is increased by 5% compared with that of continuous laser. The interfacial bonding property is comparable with that of base metal, and there is no cladding crack and blade deformation.