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.
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℃
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