Microstructure control techniques in primary hot working of titanium alloy bars: A review

How to control the microstructure of titanium alloy bars is important to fabricating high-performance aerial forgings. This paper gives a thorough survey of the manufacturing methods and microstructure control techniques for titanium alloy bars. It summarizes the effects of processing parameters on the mechanisms and laws of microstructure evolution during β working and (α + β) working, including the kinetics and grains size of dynamic recrystallization (DRX) during β deformation and the kinetics and grains size of spheroidization during (α + β) deformation. The trends in microstructure control techniques are presented for fabricating titanium alloy bars with high efficiency, low cost, and high quality by means of β/(α + β) working, and the puzzles and challenges in the future are also pointed out.