微观组织对Ti6321钛合金靶板爆炸断裂失效的影响

Ti6321 titanium alloy target plates with different microstructures were obtained through different heat treatments. The effect of microstructure on the deformation and fracture behavior of Ti6321 titanium alloy target plate during explosive loading was studied. The fracture and micro-failure analysis of target plate after explosion were carried out by using optical microscope and scanning electron microscope. The results show that the equiaxed target plate has a higher resistance to deformation, the Widmanstätten target plate has a higher resistance to spallation failure and a lower thickness reduction rate. The fracture modes include plastic deformation and central necking ring, partial break along the necking ring, complete break along the necking ring and complete tear in the center. The tensile and shear fracture occur in the bimodal target plate under the explosive loading of 200 g TNT. Under the explosive loading of 300 g TNT, the tensile, shear fracture and spallation occur in the equiaxed target plate, and the shear fracture and spallation occur in the bimodal target plate, the fractures of which are both ductile fracture. Only shear fracture occurs in the Widmanstätten target plate under the explosive loading of both TNTs, and the fracture is a mixed ductile and brittle fracture. The spallation and shear fracture of target plates are adiabatic shear failure.