Study on the Effect of Impact on the Macro- and Micro-structure of Q345 Steel Plate

In this paper, a steel plate with a three-layer spacing was impacted by reactive fragments flying at a speed of 2.2 km/s. OM, SEM (ECC, EDS), and Vickers Hardness were used to evaluate and analyze the damage characteristics of the second-layer steel plate. Numerical simulation and theoretical analysis were used to discuss and analyze the loading status of the steel plate during the impact process. The results demonstrate that the second layer of Q345 steel exhibits macroscopically significant damage and failure characteristics, such as petal tearing deformation, minor perforation, and a crater near the main center perforation. The temperature produced by the impact is higher than the steel plate's melting point, and it rapidly drops following the impact.