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系统地研究了Ni基合金自动送粉激光熔覆工艺参数对熔覆层几何形貌的影响。重点讨论了一些参数如激光作用能量密度 (Pw)、作用时间 (t)、送粉速率 (Vf)、扫描速度 (Vs)等对熔覆层宏观质量的影响规律。利用金相法检测了熔覆层的几何参数。为解释工艺参数对熔覆层宏观质量的影响提出了送粉激光熔覆覆盖率的概念 ,并利用检测的熔覆层宏观参数计算了覆盖率。覆盖率随扫描速度增加而减小 ,随送粉速率的增加而增大。在本试验条件下 ,研究结果表明 ,随激光作用能量密度和作用时间的增加 ,熔覆层的横截面面积呈线形规律增加 ,熔覆层宽化量增加 ,接触角增大 ,而且这种现象随送粉速率的增加更加显著。
The effects of laser cladding parameters of Ni-based alloy on powder coating geometry were studied systematically. Some parameters such as laser energy density (Pw), action time (t), powder feeding velocity (Vf) and scanning velocity (Vs) are discussed in detail, which influence the macroscopic quality of cladding layer. The geometrical parameters of cladding layer were examined by metallographic method. In order to explain the influence of process parameters on the macroscopic quality of cladding layer, the concept of cladding coverage of powder cladding laser cladding was proposed and the coverage was calculated by using the measured macroscopic parameters of cladding layer. Coverage decreases with increasing scan speed and increases with feed rate. Under the experimental conditions, the results show that with the increase of laser energy density and action time, the cross-sectional area of the cladding increases linearly, the cladding broadens and the contact angle increases, and this phenomenon With the powder feeding rate is more significant increase.