熔覆材料对铝合金激光熔覆性能的影响

Effect of cladding material on LY12CZ aluminium alloy by Laser Cladding

通过有效控制固体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合金、LY12合金,充分时效后进行疲劳试验、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了熔覆LY12合金试样寿命的402%,疲劳断口有明显的疲劳条带,熔覆层和基体结合得非常紧密,熔覆层内没有大的气孔和裂纹缺陷,而熔覆LY12熔覆层夹杂等缺陷较多。

Through controlling process parameters of impulse laser, current, pulse width, frequency, spot diameter and scanning velocity, laser cladding LY12 and Al-Y was used to repair corrosion damage of aluminum alloys. After cladding, fatigue test, fracture and microstructure of the specimens were studied. The result indicated that the life of the specimen cladded by Al-Y was 402% of that by LY12. There was no large pore and crack in the Al-Y layer which joined with the substrate firmly. There was much impurity in the cladding layer of LY12.