LY2铝合金激光冲击处理工艺
Laser shock peening for LY2 alloy
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摘要: 为了提高LY2铝合金疲劳寿命，探索了用激光冲击强化方法处理LY2铝合金的技术。使用流水约束层和铝箔涂层，利用波长为532 nm，脉宽为10 ns，能量为5 J，光斑直径为3 mm的YAG激光器对LY2试样进行了激光冲击强化处理。结果表明：经激光冲击强化后LY2铝合金疲劳寿命提高1.1倍。对激光冲击强化后的试件断口分析结果表明激光冲击的强化作用抑制了裂纹在试件表层的萌生和扩展，从而提高了材料的疲劳寿命。Abstract: In order to study the effects of laser shock peening on the fatigue life of LY2 aluminum alloy, water and aluminum foil were used for confining medium and ablation medium, respectively. LY2 specimens were processed with YAG laser. The laser peening parameters were: wavelength of 532 nm, pulse duration of 10 ns, and output energy of 5 J. The laser was focused on a spot of diameter 3 mm. The experimental results show that laser shock peening can increase aluminum fatigue life by 110%. Fracture analysis results show that laser shock peening strengthens the metal surface and suppresses the crack’s initiation and expansion, improving the aluminum fatigue performance．
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Key words:
- laser technique /
- laser shock peening /
- surface treatment /
- fatigue life /
- shock wave
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