Effects of different heating temperatures,cooling rates and holding time on microstructure and strengths of 8 mm thick TC4 titanium alloy plate were studied.The results show that the heating temperature significantly affects the microstructure and strength of the TC4 titanium alloy plate.The recrystallization occurs and the α phase tends to be equiaxed when the heating temperature increases from 800 ℃ to 850 ℃,resulting in the strength decreasing,the fraction of equiaxed α increases,the size and content of β phase increase where a small amount of α'phase precipitated inside when the heating temperature reaches 900 ℃,resulting in the strength increasing.When the cooling rate is higher than 10 ℃/s,the martensitic transformation occurs,and the faster the cooling rate,the greater the trend of martensitic transformation and the higher the strengths.When the holding time increases from 180 s to 600 s,the yield strength and tensile strength increase by 6.1％and 7.9％,respectively,and when the holding time further increases to 900 s,the strength increment is small.
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