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针对TC21钛合金,基于JMatPro软件模拟出合金等温转变曲线,并依据等温转变曲线制定合金在热变形后的双重退火热处理制度,并分析其组织演变规律。结果表明,当变形条件一致,合金在不同温度下退火后,组织中析出了片状的α相,随着温度升高,析出的α相尺寸也变大;当退火温度超过相变点后,由于过热原因,组织中形成了魏氏体组织。合金经二次退火后,除了生成网篮组织,还保留了退火前的一些组织特征;最后通过SEM观察合金双重退火后的组织,可知在β基体上析出了形状细小的次生α相,且随着温度的升高尺寸变大,这对合金的组织性能有一定的影响。
For TC21 titanium alloy, the isothermal transformation curve of alloy was simulated based on JMatPro software, and the double annealing heat treatment system of alloy after hot deformation was worked out according to the isothermal transformation curve. The microstructure evolution was analyzed. The results show that when the deformation conditions are the same, the α phase is precipitated in the microstructure after the alloy is annealed at different temperatures. As the temperature increases, the size of the precipitated α phase also increases. When the annealing temperature exceeds the transformation point, Due to the cause of overheating, the organization formed Wei body tissue. After the secondary annealing of the alloy, besides the formation of the basket structure, some features of the structure before the annealing are retained. Finally, the microstructure of the alloy after double annealing is observed by SEM. It can be seen that the fine secondary α phase is precipitated on the β matrix, and As the temperature increases the size increases, which has a certain impact on the organizational performance of the alloy.