Effect of Annealing Temperature on Microstructure and Mechanical Properties of TC25 Titanium Alloy Plate
TC25 titanium alloy plate with thickness of 6.0 mm were prepared by three-fire hot rolling process.The effects of annealing temperature on the microstructure,room and high temperature mechanical properties of TC25 titanium alloy plate were studied.The results show that with the increase of annealing temperature in the range of 760-840℃,the primary α phase in the equiaxed microstructure formed by hot working grows.When the annealing temperature increases to 880℃,the microstructure of TC25 titanium alloy plate is transformed from equiaxed microstructure to duplex microstructure.And the duplex microstructure is presented when the annealing temperature increases to 920℃.When the annealing temperature reaches as high as 960℃,the content of primary α phase in duplex microstructure is reduced,and the content of secondary α phase is increased significantly.The TC25 titanium alloy plate with duplex microstructure has better room and high temperature mechanical properties than the TC25 titanium alloy plate with equiaxed microstructure.Annealing at 920-960℃,TC25 titanium alloy plate with duplex microstructure and excellent mechanical properties at room and high temperature can be obtained.
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