Multi-pass Hot Deformation Behavior and Tube Preparation Simulation of TA24 Alloy
To study the high-temperature deformation behavior and the PQF(Premium quality finishing)hot rolling preparation process of TA24 alloy,the multi-pass thermal compression experiment of TA24 alloy was carried out by Gleeble-3500 thermal simulator.The strain compensation constitutive model of TA24 titanium alloy was constructed by Arrhenius hyperbolic function,and the variation of microstructure of TA24 alloy with strain rate and deformation temperature was analyzed.The changes of strain field,temperature field and rolling force during PQF hot rolling were studied by finite element simulation.The results show that the flow stress of TA24 alloy is inversely proportional to the deformation temperature and proportional to the strain rate during multi-pass deformation.With the increase of deformation temperature,TA24 alloy transforms from(α+β)phase to β phase,and the flow stress decreases accordingly.When deformed at 950℃,the change of strain rate has little effect on the microstructure,which is elongated Widmannstetter structure.The results of finite element analysis show that when the titanium tube passes through the odd frame,the maximum strain appears at the position of 0°,the minimum strain appears at the position of 60°,while the result of even number of frames is opposite.The radial displacement of the titanium tube at 0° position and 30° position decreases when passing through the odd frame,and increases when passing through the even frame,while the radial displacement at 60° position shows the opposite trend.In addition,the rolling metal flows from the bottom of the pass to the roll gap during the rolling process,and the overall rolling force is 170-700 kN.
TA24 titanium alloyhot deformation behaviorPQFfinite element
万方数据
维普
