Effect of strain rate on dynamic recrystallization microstructures of β hot process for TA15 titanium alloy

Isothermal constant strain rate compression tests on TA15 alloy were carried out in the strain rate range of 0.001s-1～10s-1 and true stress range of 0.03～1.2 by using the THERMECMASTER-Z hot working simulator at temperature 1050℃.The results of experiments indicate that improving strain rate could obviously decrease the average grain size,and when the strain rates are in lower level (0.001s-1,0.01s-1),increasing the strain rate could make grain size down faster.According to the effect of grain refinement and uniformity in the microstructures which deformed under various conditions,the strain rate of 0.01s-1 is preferable for hot working.