Dynamic fracture behavior of 11MnNiMo steel under medium-low loading rate

In this work, the dynamic fracture behavior of 11MnNiMo steel under medium-low loading rate was studied. In the fracture morphology with and without prefab crack, the fracture surface had obvious morphological partition phenomenon. In comparison, there were more crack roots in the crack root region with preset cracks and gradually expanded to the interior. Transmission analysis showed that there were many displacements in the matrix and dispersed secondary phase particles, which should be MnS impurity phase. In the microstructure of 11MnNiMo matrix, the elongated morphology of lath martensite structure was retained. During the process of impact shear deformation, massive plastic deformation was associated with the material, so that a great deal of displacements led to the movement of the slip system. At the same time, the transmission analysis showed that there was elastic stress inside the impact fracture.