The effect of shot peening (SP) and vibration finishing (VF) on the fatigue performance of TC17 alloy at room-temperature was investigated. Meanwhile, to match the high-temperature service environment of the blade, the thermal exposure test and high-temperature fatigue test were also performed. The improvement in fatigue performance at room-temperature by SP + VF process was more than that by SP alone. After thermal exposure at 300 °C for 100 h, the high-temperature (300 °C) fatigue strength of the composite-treated sample remained 18.2% higher than that of the substrate. This is mainly because that SP + VF can induce lower surface roughness and remaining relatively stable gradient microstructure and compressive stress residual layer compared with SP.

研究了喷丸强化(SP)和振动精加工(VF)对TC17合金室温疲劳性能的影响。同时，为了匹配叶片的高温使用环境，还进行了热暴露试验和高温疲劳试验。SP+VF工艺在室温下的疲劳性能改善幅度大于单独使用SP工艺。在300℃下热暴露100h后，复合处理样品的高温（300℃）疲劳强度仍比基体高18.2%。这主要是因为与SP相比，SP+VF可以诱导较低的表面粗糙度并保持相对稳定的梯度微观结构和压应力残余层。