Numerical Simulation And Experimental Study On TA1/q345 Explosion Welding

TA1/Q345 bimetallic plate has excellent corrosion resistance as well as higher mechanical strength,there is considerable demand for explosion-bonded TA1/Q345 bimetallic plate in engineering fields,such as aerospace,petro-chemical engineering and ocean engineering.It is ephemeral and dangerous in the actual explosive welding process and it is also time-consuming and laborious.Moreover,the residual stress of explosive welding bimetallic plate has great influence on the quality of products during the production process and subsequent processing.Therefore,it is of great theoretical and practical significance to improve the quality of the TA1/Q345 bimetallic with the study of the residual stress,microstructure and mechanical properties at the same time,with the optimization parameters of the numerical analysis of the explosive welding.The following results are obtained:1 The explosion welding process parameters are calculated by theoretical formula and the numerical simulation scheme is determined.The TA1/Q345 explosion welding process and the variation of the instantaneous parameters,such as velocity field,Z displacement,pressure field,plastic strain field,and other effect force field is studied by numerical simulation.At the same time,the parameters of explosive welding are adjusted and the quality of bimetallic plate is compared.The optimal welding parameters can be obtained that fly plate thickness is 0.2cm,basic plate thickness is 1.0cm,explosive thickness is 1.9cm,spacing between fly plate and basic plate is 0.6cm.2 the residual stress and it's distribution of the interface and thickness direction of the bimetallic plate after explosive welding,heat treatment,and leveling are measured by the blind hole method and fayer-removal method.The result show that the residual stress in the explosive state interface of TA1/Q345 bimetallic plate is tensile stress,and the residual stress in the detonating point and the place near the boundary is larger.As a whole,the propagation direction of the detonation wave gradually decreases from the initiation point to the edge,which is consistent with the law obtained by the numerical simulation.The residual stress at the interface of heat treated state is in the state of pressure stress,and the distribution is uniform.The residual stress of leveling state interface back to the tensile stress state,tensile stress is less than or equal to 45MPa;The residual stress in the thickness direction of the explosive state bimetallic plate is the largest at the interface.The residual stress at the interface coincides with the test results of blind hole method.The residual stress distribution in the thickness direction of the heat treated bimetallic plate is more uniform,and most of them are in the pressure stress state.3 By the experiment study,bimetallic plate interface will be grasped further in explosive welding.there is a positive spin wave at the interface of the bimetallic plate,and serious plastic deformation occurs on the side of the interface substrate.The diffusion of Ti and Fe atoms exists at the interface.There are ?-Ti,?-Fe and TiFe2 phases on the interface.The TiFe2 content is little,so,it has little effect on the quality of the bimetallic plate,and the interface is mainly small angle grain boundaries.The micro-hardness test shows that the maximum hardness of the interface appears at the peak,and the micro-hardness reaches the highest value at the interface,and the parent material decreases gradually along the boundary.The tensile and shear strength of the bimetallic plate meet the use requirements.