通过有效控制固体YAG脉冲式激光器的电流、脉冲宽度、频率、光斑直径、扫描速度等有关工艺参数, 模拟飞机腐蚀损伤的铝合金试样表面激光熔覆Al-Y(Y的质量分数为4%)合金,Al-Si(Si的质量分数为12%)合金, 充分时效后进行疲劳实验、疲劳断口分析和金相分析。结果表明, 熔覆Al-Y合金试样的安全寿命达到熔覆Al-Si合金试样寿命的339％, 熔覆层和基体结合得比较紧密, 熔覆层气孔、夹杂等缺陷较少, 疲劳断口裂纹扩展区存在疲劳条带和疲劳台阶, 熔覆 Al-Si合金试样的熔覆层气孔缺陷较多, 没有呈现低周疲劳的特征。

In order to find a good method to repair the corrosion damage of LY12CZ, laser cladding Al-Y (4%Y) and Al-Si (12%Si) powder on LY12CZ was studied by changing the technological parameters of the YAG pulsed laser, such as current, pulse width, frequency, spot diameter and scanning velocity. Through studing the fatigue test, analyzing the fatigue fracture and metallic phase, the result shows that the fatigue life of the laser cladding Al-Y is 339% of the cladding Al-Si alloy specimens. There was little pore and impurity in the Al-Y layer which joins with the substrate firmly. There is fatigue ribbon and fatigue setback in the expansion region of the crack. There are many holes in the Al-Si layer which does not appear the low-cycle fatigue characteristic.