Effect of Stress Ratio on Fatigue Crack Growth Behavior of Ti-6Al-2Zr-1Mo-1V Alloy
Effect of Stress Ratio on Fatigue Crack Growth Behavior of Ti-6Al-2Zr-1Mo-1V Alloy
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- New search for: JI Yingping
- New search for: WU Sujun
The fatigue crack growth behaviors of Ti-6.5Al-2Zr-1Mo-1V titanium alloy at different positive stress ratios (R = 0.1, 0.3 and 0.5) were investigated at room temperature. The effects of stress ratio R on the fatigue crack growth rates and fractures morphology were discussed. The results show that with the increase of stress ratio R , the fatigue crack growth rates are increased at the given applied cyclic stress intensity factor, ΔK. Equivalently, the observed threshold stress-intensity range ΔKth and the range of stress intensity factor ΔK for fatigue crack growth are decreased as the positive stress ratio is increased. Some fatigue steps and secondary cracks are observed on the fracture surfaces of the specimens tested at the three stress ratios. In addition, with the increase of the stress ratio, the toughness of the surface is increased and the secondary cracks are decreased. However, the fatigue fracture mechanisms of Ti-6.5Al-2Zr-1Mo-1V titanium alloy tested at the three stress ratios are all the same, which the fractures are all presented in transgranular mode.
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Effect of Stress Ratio on Fatigue Crack Growth Behavior of Ti-6Al-2Zr-1Mo-1V Alloy
2018
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