Dynamic recrystallisation in adiabatic shear bands

An XC18 steel material in bcc structure was deformed in double shear with a Hopkinson bar at a projectile speed of 97 m/s. With the help of micrograph s, the local shear strain distributions have been examined. The EBSP techni que was used to measure the orientation of the grains from which the orient ation distribution function (ODF) was constructed. The crystallographic tex tures are presented in form of ODF-sections. The measured textures were com pared to the dynamic recrystallisation (DRX) textures observed in low carbo n steels for shear deformation [1]. In this way, it was possible to conclud e that DRX took place in the shear bands of this material. The texture vari ations, which accompany the DRX process, have been successfully modelled wi th the help of a self-consistent viscoplastic polycrystal model which was m odified for the DRX process [2].