The improving effects of combined laser shock peening (LSP) and shot peening (SP) treatment on the physical properties, microstructure characteristics and foreign object damage resistance of Ti-6Al-4V alloy aerofoil specimens were studied. The surface micro-hardness of specimens after combined LSP + SP treatment is 20% higher than that of the base material, with an affected layer depth of about 400 μm; while the maximum residual compressive stress of samples is −843.2 MPa with a layer depth of about 640 μm. Severe plastic deformation occurred on the subsurface of the specimen after combined LSP + SP treatment, and the depth of grain refinement layer was about 60 μm. The subsequent foreign object damage (FOD) test showed that the combined surface treatment improved the hardness of specimens to effectively resist the damage caused by low energy impact, but the effect is not so obvious for high energy impact. For LSP + SP treated specimens impacted by 1-mm-diameter steel balls, the high cycle fatigue (HCF) strength at 10⁷ cycles improved most, which is nearly 35% higher than that of the untreated specimens. The enhancement is mainly due to micro-hardness maximization and residual compressive stress field introduced by combined LSP + SP treatment.

研究了激光冲击强化（LSP）和喷丸强化（SP）联合处理对Ti-6Al-4V合金翼型试样物理性能、显微组织特征和抗异物损伤能力的改善效果。LSP+SP组合处理后试样表面显微硬度比母材高20%，影响层深度约400μm；而样品的最大残余压应力为-843.2 MPa，层深约为640 μm。LSP+SP联合处理后试样次表面发生剧烈塑性变形，晶粒细化层深度约为60 μm。随后的异物损伤（FOD）试验表明，组合表面处理提高了试样的硬度，有效抵抗低能冲击造成的损伤，但对高能冲击效果不明显。对于由 1 毫米直径钢球冲击的 LSP + SP 处理的试样，10 时的高周疲劳 (HCF) 强度⁷个周期改善最多，比未经处理的标本提高近35%。这种增强主要是由于 LSP + SP 组合处理引入的显微硬度最大化和残余压应力场。