Numerical Simulation For Explosive Welding And Analysis For Heat Treatment Process Of TA1/Q345 Clad Plate

With the development of modern science and technology,titanium-steel clad plate has been widely used in the petrochemical and pressure vessel industry,and titanium-steel clad plate also has already been an essential structure material for modern industry.Explosive welding is one of the main methods to produce titanium-steel clad plate,but it is ephemeral,dangerous in the actual explosive welding process,and explosive welding test is time-consuming and laborious.In the paper,using finite element software ANSYS/LS-DYNA,the research on numerical simulation of explosive welding process of TA1/Q345 clad plate has been conducted.Also the effect of explosive parameters on the clad plate quality is studied,which not only can improve the design efficiency,also reduce the design cost.At the same time,The microstructure and mechanical properties of TA1/Q345 clad plate under different heat treatment process is studied.and selects the best heat treatment process to improve the performance of titanium-steel clad plate,this will provide certain reference for practical engineering applications.The results show that explosive welding process is divided into four parts:flyer plate is subjected to explosion shock wave,happening to plastic deformation,flying to base plate in high speed and crashing with base plate.The edge of flyer plate fails to weld with base plate eventually,this is consistent with the actual boundary effect in the explosive welding process.With the distance from the initiation point of explosive welding farther,the element pressure and speed are increasing.Clad plate is still within the residual stress after explosive welding.Then,for certain flyer plate thickness and explosion thickness,the speed and plastic strain of flyer plate gradually increases first,then decrease.Von Mises stress of flyer plate is minimum when the distance between base plate and flyer plate is 1.1 cm,and the combination of explosive welding is good.For certain distance between base plate and flyer plate,flyer plate can composite with base plate when the explosive thickness is 3.0 cm and 3.6 cm.When the explosive thickness is 4.0 cm,combining effect is not ideal.The plastic deformation is lager and Von Mises stress is minimum when the explosive thickness is 3.6 cm.So the ideal explosive thickness is 3.6cm.On the other hand,the microstructure of TA1/Q345 clad plate is fibrous,occurring plastic deformation,and this is the most serious in the interface.With the increase of heat treatment temperature,the microstructure occurs to recrystallization,and grains grow up.At the same time,Microhardness in the interface is bigger than it on the both sides.Microhardness decreases in totality after 480 ? and 600 ? keeping 4 hours heat treatment,but the microhardness in the interface moved up sharply when heat treatment at 700 ? keeping 4 hours.Tensile strength of clad plate gradually decreased,and plasticity is better at 600 ?keeping 4 hours heat treatment.Meanwhile,shear strength reduced with the temperature of heat treatment.Also TA1/Q345 clad plate doesn't occur the crack of titanium layer as outer bending to 90 ° after heat treatment.