Influence of Aging Temperature on Microstructure and Creep Properties of Hot Continuous Rolled Ti-6Al-4V Alloy

Hot continuous rolling technique is a new processing method for preparing Titanium alloy, which may decrease the production cost and realize continuous industrial manufacture. Ti-6Al-4V alloy was prepared by hot continuous rolling (HCR) and solution and aging treated at different temperature. Creep curves of the alloys were measured, microstructure evolution feature of the alloys during creep was observed by SEM and TEM. The influence of aging temperature on the microstructure and creep property of the alloy is briefly discussed. Results show that, the microstructure of HCR alloy after solution treatment at temperature higher than beta phase transus point consists of the fully "basket weave" structure. The alloy aged at 750 degrees C has higher strain rate and shorter creep lifetime, strain rate of the alloy during steady-state creep is measured to be 0.69 x 10(-7)/s, creep lifetime is measured to be 180h, and strain rate of the alloy aged at 480 degrees C is measured to be 0.33 x 10(-7)/s. The alloy aged at lower temperature has longer creep lifetime than the alloy aged at high temperature.