Flow Stress Prediction of Hydrogenated Ti6Al4V Alloy Based on Self-Consistent Model

The isothermal compression tests of hydrogenated Ti6Al4V alloy at deformation temperatures of 750, 800, 850, 900, 950 and 1000 degrees C and strain rate of 1 s(-1) were carried out on a Gleeble-1500 thermal simulator. The results show that the flow stress of Ti6Al4V alloy decreases first and then increases with the increase of hydrogen content. When the deformation temperature is 750, 800 and 850 degrees C, the flow stress of alloy at hydrogenation content of 0.31wt% is the lowest. When the deformation temperature is 900, 950 and 1000 degrees C, the hydrogenation content corresponding to the minimum flow stress is 0.17%, 0.1% and as received, respectively. The high temperature deformation constitutive model of hydrogenated Ti6Al4V alloy was established based on the self-consistent model. The model reflects the effect of hydrogen on the flow stress of Ti6Al4V alloy by adjusting the strengthening effect of hydrogen on beta phase and reducing the transition temperature of beta phase. Compared with the experimental results, it is shown that the model can predict the variation of flow stress with hydrogenation content and deformation temperature well.