Abstract
In view of the difficulty of manufacturing titanium alloy tubes, a U–O forming process was proposed to manufacture tubes with TA15 titanium alloy. The effect of the U–O forming process on the microstructure evolution of typical regions of TA15 tubes was investigated using electron backscattered diffraction technique. Results showed that the grain size of the U-shaped part was uniform when deformed at 750°С. Through microstructure evaluation of the O-shaped part, there were only slight changes concerning grain size compared with the initial plate because of the deformation sequence. However, in general, no significant changes concerning the grain size of most regions were observed when comparing the O-shaped tube with the initial plate, which indicated that the U–O forming process did not cause obvious changes in the initial microstructure in terms of grain size.
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