针对飞机叶片激光熔覆的特殊要求,利用横流CO2激光器及加工系统,系统地研究了连续/脉冲CO2激光对K403材料熔覆质量的影响规律。结果表明,相同线能量下脉冲激光熔覆与连续激光熔覆相比,外表光滑、平整、熔覆层与基体的界面结合完整,稀释率低20%,熔覆层硬度高5%,热影响区小50%。脉冲激光熔覆K403材料减少了合金元素的聚集和低熔点共晶组织的形成,缩小了“液态薄膜”的产生范围,同时由于基材变形小,降低了冷却凝固过程中的拉应力,较高的过热度使熔覆层液体与基体液体充分混合,降低了基体的脆性,解决了K403材料连续CO2激光熔覆易产生裂纹的问题。 According to the special requirements of laser blade cladding, the effects of continuous / pulsed CO2 laser on the cladding quality of K403 were systematically studied by using cross-flow CO2 laser and processing system. The results show that the pulsed laser cladding is smooth and smooth compared with the continuous laser cladding at the same linear energy. The interface between the cladding and the matrix is ​​intact, the dilution rate is 20% lower, the cladding hardness is 5% higher, and the thermal influence Small area 50%. Pulsed laser cladding of K403 material reduces the alloying elements and the formation of low melting point eutectic structure and narrows the production range of the “thin film”, and at the same time reduces the tensile stress in the cooling and solidification process due to the small deformation of the substrate, The higher superheat makes the coating liquid and the base liquid sufficiently mix, reducing the brittleness of the matrix and solving the problem that the K403 material can easily crack during the continuous CO2 laser cladding.