采用OM、XRD和TEM研究了预冷变形对TC21合金在时效过程中相变的影响规律。结果表明:随预冷变形量增加,在晶界上析出的次生α相增多,原β相晶界变得更明显。预变形能加速马氏体α’相分解出α相和β相。同时,预变形不能改变物相的类型,但能改变相对量;同时使马氏体α’组织中孪晶组织趋于消失,并改变了亚结构的微观形态特征。 The effects of pre-cooling deformation on the phase transition of TC21 alloy during aging were investigated by OM, XRD and TEM. The results show that with the increase of pre-cooling deformation, the secondary α phase precipitated on the grain boundary increases, the original β phase boundary becomes more obvious. Pre-deformation can accelerate the martensite α ’phase decomposition α and β phase. At the same time, the pre-deformation can not change the type of phase, but it can change the relative amount. At the same time, the twin structure in the martensite α ’tends to disappear and changes the microstructure characteristics of the sub-structure.