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摘要
To further improve comprehensive mechanical properties of titanium alloy, the unconstrained high-pressure torsion process was used to conduct large plastic deformation on the titanium alloy blank. The flow of blank, equivalent strain of surface layer, thickness and diameter of the blank under the conditions of axial pressure of 3 GPa, shear friction factor of 1. 0, torsion speed of 0. 628 rad·s-1 and torsion duration of 10 s were analyzed by finite element simulation method. The general law of finite element simulation of high-pressure torsion is obtained, that is, the distribution curves of equivalent strain of titanium alloy after torsion are M-shaped. With the above conditions unchanged, the single variable was changed in turn, and the influence of parameters on the billet deformation was analyzed. The results show that the distribution curves of equivalent strain of titanium alloy after high pressure torsion are still M-shaped, and with the increase of axial pressure, shear friction factor and the number of torsion turns, the thickness of blank decreases, and the diameter of blank increases. In order to verify the accuracy of the simulation, experimental researches were carried out on the basis of the simulation to explore the changes of thickness, diameter and hardness of the deformed blank, which further explained the accuracy of the simulation. At the same time, the mechanical properties of the deformed blank are obviously improved. The difference of torsion parameters and friction coefficients can affect the deformation degree of the workpiece. By using larger shear friction factor and increasing axial pressure, the workpiece with large deformation can be obtained, and its mechanical properties are relatively outstanding. ? 2023 Beijing Res. Inst. of Mechanical and Elec. Technology.
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