Adiabatic heating and energy absorption capability of an advanced high strength steel during drop weight impact testing

Abstract

The manuscript focuses on the energy absorption capability of an advanced high strength steel during drop weight impact testing. The in-situ measurements of temperature during impact resistance testing of samples revealed intensive adiabatic heating effect with the peak temperature of 225 ℃ at the top of the dome resulting in the local softening effect. The drop weight impact resistance of the material under present testing condition is 90 J. Microstructural characterization demonstrated that dislocation glide and formation of substructure is the main deformation mechanism. Analysis of fracture surface of cracked samples (tested with the impact energy of > 90 J) revealed ductile failure mode. The energy required for formation of fracture surface was calculated by quantitative analysis of the 3D digital models generated using microscopy images of the fracture surface taken from different angles. This energy is negligibly lower compared to the total energy spent for plastic deformation of the material.