Effect of strain aging of carbon steel after dynamic loading

The tendency of the samples of the carbon steel U8 after (i) dynamic compression, which has been executed by throwing a steel flat striker by means of a gas gun, (ii) explosive processing of a cylindrical workpiece and quasistatic compression to strain aging has been investigated. The Finite Element Method with the application of the Johnson–Cook model has been utilized to estimate the strain after dynamic loading. The scale of strain aging has been determined from the change in the microhardness $(\Delta H_v)$ of the steel after annealing in the temperature range of 150–500$^\circ$C, likewise from the change in the highest of the Snoek–Koester peak on the temperature curve of internal friction. It has been demonstrated that the maximum scale of strain aging is observed after dynamic compression.