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通过试验研究了激光冲击强化(LSP)对LY2铝合金表面残余应力、硬度分布、显微组织及疲劳寿命的影响。结果表明:LSP后LY2铝合金表面的残余压应力和硬度显著提高,晶粒尺寸明显变小且更均匀,疲劳裂纹扩展更加缓慢,疲劳寿命显著提高。

Effects of laser shock peening (LSP) on surface residual stress, hardness distribution, microstructure and fatigue life of LY2 aluminum alloy were studied by experiments. Results show that the surface compressive residual stress and microhardness of LY2 aluminum alloy processed by laser shock peening were enhanced. The grains became finer and more uniform, which restrained the fatigue crack growth and resulted in the increase of fatigue life obviously.

参考文献

[1] 马壮,李应红,汪诚,张永康.激光冲击处理对LY2航空铝合金低循环疲劳寿命影响研究[J].材料热处理学报,2007(z1):46-48,57.
[2] 周磊,李应红,汪诚,周鑫.LY2铝合金激光冲击处理工艺[J].强激光与粒子束,2010(08):1780-1784.
[3] 何卫锋,李应红,李启鹏,李伟,周磊.涡轮叶片榫槽部位激光冲击强化试验研究[J].中国激光,2010(07):1898-1902.
[4] 鲁金忠 .激光冲击强化铝合金力学性能及微观塑性变形机理研究[D].江苏大学,2010.
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