Low Cycle Fatigue Performance of Laser Deposited Ti65 Titanium Alloy
The low-cycle fatigue experiment of Ti65 titanium alloy manufactured by laser deposition was carried out at room temperature,and the low-cycle fatigue performance of high and low power samples was compared.The results show that both high and low power samples show the characteristics of cycle softening,and the softening rate of the sample is constantly increasing with the increase of strain amplitude.The high power specimens have higher softening rates and fatigue life than the low power specimens at the same strain amplitude.The fatigue life was predicted by the damage evolution model,and the prediction results were quite accurate,all within the 1.5-fold dispersion band.Under low strain amplitude,the fatigue source of the low-power specimen germinates from stomatal defects,the fatigue source of high-power specimen germinates from surface cracks,and the crack initiation speed of the low-power specimens is significantly faster than that of the high-power specimens,and the fatigue life is lower.Under high strain amplitude,the specimen has multiple fatigue sources,and the fatigue life is significantly reduced.The cracks of different power specimens are propagated in the form of through-crystal fractures.
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