Numerical Simulation Of Multidirectional Forging Of TA10 Titanium Alloy

TA10 titanium alloy is a kind of near-alpha titanium alloy.It has strong crack corrosion resistance in high temperature and high concentration chloride.It also has good plasticity,cold forming and weldability.It is widely used in sealing surface materials of container equipment and can be used to manufacture strippers,vacuum salt making device and pipeline.The mechanical properties of titanium alloy are very sensitive to processing parameters,so it is very important to study the properties of titanium alloy by using appropriate hot deformation process.Multi-directional forging technology changes constantly the forging direction during the multi-directional forging,the samples are constantly compressed and elongated in three directions to achieve the purpose of improving microstructure and properties of the alloy.In this paper,TA10 alloy is taken as the research object,and the high temperature compression deformation behavior of TA10 alloy is studied by thermal / mechanical simulation experiment.It is found that the flow stress of TA10 alloy increases with the decrease of deformation temperature and the increase of strain rate.Based on the stress-strain curve of TA10 alloy during high temperature deformation,the influence of equivalent strain,deformation temperature and strain rate on deformation behavior is studied This paper establishes the constitutive relation of TA10 alloy during high temperature deformation,constructs the hot working diagram of TA10 alloy by DMM model,and determines the optimum range of technological parameters during high temperature deformation of TA10 alloy,so as to provide theoretical basis for the actual production of workpiece.The constitutive relationship of TA10 alloy was input into the material library of Deform-3D software.The damage value,maximum principal stress,and effective strain during the multi-directional forging are analyzed.The effect of deformation temperature,deformation rate and forging step on multi-directional forging deformation was revealed.Simulation results show that the reduction of deformation temperature,the increase of deformation rate and the increase of forging step will increase the damage value of the blanks after deformation.After the multi-directional forging deformation of the alloy blank,the damage value of the bulge is large and the damage value at the center is small.By increasing the deformation temperature and decreasing the deformation rate,the maximum compressive stress and the maximum tensile stress of the deformed billet can be reduced,which is consist with high temperature compression experiment.The ideas and methods of this research can be applied to other newly developed alloy processing experiments,so as to select the appropriate forging process parameters according to the product requirements,and greatly reduce the research and development cycle and experimental costs of new product and new process test.