采用高能量激光束对AISI 8620合金钢表面进行冲击强化，利用CETR UMT-2摩擦磨损试验机对激光冲击试样表面进行磨损试验，并用扫描电子显微镜观察磨痕表面的形貌，研究激光冲击强化技术对AISI 8620合金钢耐磨损性能的影响。结果表明，激光冲击在AISI 8620合金钢表层形成残余压应力层，虽然残余压应力会降低氧化磨损和粘着磨损的抗性，但是会增加疲劳磨损的抗性，使AISI 8620合金钢试样的耐磨性提高1倍，多次冲击耐磨性能会更好。随着载荷的增加，激光冲击的AISI 8620合金钢试样的平均摩擦系数呈现先缓慢减小后缓慢增加的趋势。

We address the effects of processing parameters on residual stresses and fatigue properties of LY2 Al alloy by laser shock processing (LSP). Results show that compressive residual stresses are generated near the surface of samples due to LSP. The maximum compressive residual stress at the surface by two LSP impacts on one side is higher than that by one LSP impact. The maximum value of tensile residual stress is found at the mid-plane of samples subjected to two-sided LSP. Compared with fatigue lives of samples treated by single-sided LSP, lives of those treated by two-sided LSP are lower. However, these are higher than untreated ones.

采用激光冲击强化技术对LY2铝合金表面进行处理, 利用扫描电镜和透射电镜对塑性变形层深度方向的不同区域进行结构表征,测量了元素成分的变化，并对激光冲击强化铝合金的微观机理进行深入的研究。结果表明,激光冲击能够在LY2铝合金表面产生亚微米级的亚晶结构, 深度方向的位错结构从随机分布位错到位错线，再到位错缠结，最后到亚晶进行逐步演变，最终形成细化的晶粒。激光冲击的超高应变率对于粗晶的细化和最小平均晶粒尺寸的大小具有至关重要的作用。