Research Progress on Microscopic Mechanism of Cryogenic Ultrasonic Rolled Titanium Alloy
A single ultrasonic rolling process can not guarantee the plasticity of titanium alloy while improving its strength.How to break through the limits of conventional ultrasonic rolling plastic deformation and grain refinement,improve the strength and hardness of titanium alloy to improve its serviceability under the premise of maintaining good plasticity and toughness has become a key problem to be solved in the surface strengthening research of titanium alloy.Temperature and strain rate can change the microplastic deformation mechanism of materials,which is the key factor to solve the strong plas-tic matching problem of materials.Cryogenic ultrasonic rolling provides competition between cryogenic temperature and high strain rate,harmonizes the microplastic deformation mechanism,and has the potential to further improve the performance and life of titanium alloys.Based on the analysis of the influence of temperature and strain rate,the working principle of cry-ogenic ultrasonic rolling and its strengthening effect on the surface properties of titanium alloy are introduced.The results of experimental studies on ultrasonic rolling processing titanium alloy,cryogenic treatment of titanium alloy and the introduc-tion of cryogenic treatment on the basis of ultrasonic rolling in recent years are reviewed.The microstructure evolution and plastic deformation mechanism of titanium alloy under cryogenic ultrasonic rolling are analyzed.The internal correlation be-tween the microscopic plastic deformation mechanism and the macroscopic properties of titanium alloy after cryogenic ultra-sonic rolling is summarized.The development trend of cryogenic ultrasonic rolling in technology,equipment and strengthe-ning mechanism is pointed out.
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维普
