采用TEM,XRD技术研究了多晶纯钛滚压形变强化疲劳前后的显微组织特征和残余应力.实验结果发现:多晶纯钛疲劳抗力的提高主要是由于形变显微组织和残余压应力的产生及表面粗糙度的降低.滚压组织中形成高密度位错和单个?分散的变形孪晶,历经106以上的循环周次后,孪晶-晶界的交互作用是其主要特征.疲劳后次表面残余压应力松弛较表面严重. The microstructure and residual stress of polycrystalline pure titanium before and after rolling deformation strengthening fatigue test were studied by TEM and XRD.The experimental results show that the improvement of fatigue resistance of polycrystalline pure titanium is mainly due to the deformation microstructure and residual compressive stress Generation and surface roughness reduction.High-density dislocation and a single dispersion of deformation twins formed in the rolling organization.The interaction of twin-grain boundary is the main feature after more than 106 cycles.After fatigue Sub-surface residual compressive stress relaxation than the surface serious.