Kasuga M, Sano T and Hirose A. Grain refining in weld metal using short-pulsed laser ablation during CW laser welding of 2024-T3 aluminum alloy. Int. J. Extrem. Manuf1, 045003 (2019).. DOI: 10.1088/2631-7990/ab563a
引用本文: Kasuga M, Sano T and Hirose A. Grain refining in weld metal using short-pulsed laser ablation during CW laser welding of 2024-T3 aluminum alloy. Int. J. Extrem. Manuf1, 045003 (2019).. DOI: 10.1088/2631-7990/ab563a
Kasuga M, Sano T and Hirose A. Grain refining in weld metal using short-pulsed laser ablation during CW laser welding of 2024-T3 aluminum alloy. Int. J. Extrem. Manuf. 1, 045003 (2019).. doi: 10.1088/2631-7990/ab563a
Citation: Kasuga M, Sano T and Hirose A. Grain refining in weld metal using short-pulsed laser ablation during CW laser welding of 2024-T3 aluminum alloy. Int. J. Extrem. Manuf. 1, 045003 (2019).. doi: 10.1088/2631-7990/ab563a

2024-T3铝合金连续激光焊接过程中短脉冲激光烧蚀的晶粒细化

  • 摘要:

    2024铝合金以其优异的力学性能在航空航天工业中应用广泛。然而,由于含有大量的导致凝固裂化的铜(Cu)、镁(Mg)和锰(Mn)等溶质,2024铝合金的可焊性通常较低。如果不使用填料就能实现2024铝合金高速焊接,其适用性将得到扩展。晶粒细化是防止金属焊接凝固裂化的方法之一,但还未实现2024铝合金无填料高速激光焊接。本文在连续波激光焊接过程中提出了一种短脉冲激光诱导晶粒细化方法,以实现无填料激光焊接。采用波长1070nm、功率1kW的单模光纤激光,在2024 T3铝合金上以1 mmin−1的速度进行平板堆焊。用波长1064nm、脉冲宽度10ns、脉冲能量430mJ的纳秒激光脉冲辐射熔池及周围区域。当激光脉冲辐照熔池时,证实了晶粒细化效应。晶粒细化区沿固液界面呈半圆状。垂直截面的结果表明,沿固液界面的晶粒细化区达到1mm的深度。Vickers硬度试验结果表明晶粒细化导致硬度增加,凝固裂化过程在晶粒细化区得到抑制。

     

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