Ti–5Al–5Mo–5V–1Cr–1Fe合金高周疲劳性能及断裂行为的研究

Study on the High Cycle Fatigue Properties and Fracture Behavior of Ti–5Al–5Mo–5V–1Cr–1Fe Titanium Alloy

摘要:

研究了在不同应力集中系数K_t和应力比R下Ti-5Al-5Mo-5V-1Cr-1Fe (Ti-55511)锻件和棒材纵向的室温高周疲劳性能及断口形貌。结果表明：应力比和应力集中系数是影响疲劳性能的两个重要因素。锻件和棒材的疲劳强度均随应力比R的增大而增大,随应力集中系数K_t的增大而减小。锻件的疲劳性能优于棒材,并且锻件的疲劳强度是棒材的1.08~1.57倍。

Abstract:

Under different stress concentration factors K_t and stress ratios R, the high cycle fatigue (HCF) properties and fracture morphologies of Ti–5Al–5Mo–5V–1Cr–1Fe (Ti-55511) forgings and bars in longitudinal orientation were studied at room temperature. The results show that stress ratio R and stress concentration factor K_t are two important factors that affect the fatigue properties. Both the fatigue strength of forgings and bars increases with increasing stress ratio and decreases with increasing stress concentration factor. The fatigue properties of forgings are better than bars, and the fatigue strength of forgings is 1.08~1.57 times greater than that of bars.