Experimental Study on Dynamic High Pressure Properties of G54 Steel

G54 steel is a new type of ultra-high strength steel independently developed in China, which has strong potential application value. In order to study the dynamic high-pressure performance of the material and provide data support for its application and popularization, the flyer symmetric impact experiments of G54 steel were conducted by using artillery as loading means. The experimental flyer velocities ranged from 600 m/s to 1400 m/s. By measuring the velocity-time history of particles on the back surface of G54 steel samples, the typical impact transformation and spallation signals were obtained. By analyzing particle velocities, material density and sound velocity measurements, the Hugoniot elastic limit, spallation strength, shock wave velocity-particle velocity (D-u) relationship and impact transformation point of G54 steel under impact pressure of 13–23 GPa were obtained. The metallographic analysis results of the recovered sample show that the damage mechanism of the spallation surface changes from ductile fracture dominated by micropore polymerization to ductile fracture dominated by adiabatic shear with the increase of flyer velocity.