【摘要】 采用喷丸和离子注入对Ti-6-22-22合金机械加工样品进行表面处理,研究表面处理对Ti-6-22-22合金室温和高温疲劳寿命的影响。结果表明,喷丸和离子注入对材料疲劳S-N曲线的影响与实验温度有关。喷丸和离子注入对Ti-6-22-22合金的室温疲劳强度影响较小,400℃时的疲劳强度明显提高。SEM断口分析显示,400℃长寿命疲劳后的表面处理样品裂纹在亚表面萌生。更多还原

【Abstract】 Shot-peening and ion implantation were adopted to treat the surface of the machined specimens of Ti-6-22-22 alloy, and the stress controlled fatigue tests were performed at room temperature and 400℃, respectively. Experimental results indicated that the effect of shot-peening and ion implantation on the S-N curves is related to temperature. Both shot-peening and ion-implantation have little effect on the fatigue strength at room temperature, but substantially increase the fatigue strength at 400℃ comparing with the untreated counterparts. SEM fractography surface analysis indicates that fatigue cracks of the treated samples initiate at subsurface after long-time fatigue at 400℃.更多还原