电冲击处理对钛合金残余应力及疲劳性能的影响OA

Regulating residual stress and optimizing stress distribution in metallic materials is crucial for enhancing fatigue performance.This study systematically investigates the effects of electroshocking treatment(EST)on the residual stress regulation and vibration fatigue properties of TC11 titanium alloy.The results demonstrate that EST significantly homogenizes the surface and gradient macroscopic resid-ual stress without significantly altering the phase structure.XRD and EBSD analyses reveal that after EST,the dislocation density is reduced by 9.68%,the standard deviation of the KAM value is decreased by 20%,the microstrain is effectively mitigated,and the stress concentration zones are substantially eliminated.Vibration fatigue tests confirm that the average fatigue life of the specimens is remarkably improved from 4.55×105 cycles to 3.60×106 cycles.Further HRTEM analysis verifies that the energy generated by EST can drive atomic rearrangement in stress concentration regions,thereby reducing dis-location density and alleviating lattice distortion.In summary,EST provides an efficient and novel strategy for precise residual stress regulation and fatigue performance enhancement of TC11 titanium alloy.