Abstract
In this study, a novel high entropy steel (HES) was meticulously engineered to have an austenitic structure with a medium stacking fault energy. To investigate the hot deformation behavior of the developed HES, hot compression tests were carried out at 950 °C–1100 °C, coupled with strain rates ranging from 0.001 to 1 s−1, to reach a true strain level of 0.5. The comprehensive microstructural analyses on the hot compressed samples revealed the occurrence of partial dynamic recrystallization (DRX) at the majority of the deformation conditions. The appearance of flow curves as well as the characterized microstructures suggest the notably sluggish recrystallization kinetics when compared to more common austenitic steels. The underlying cause behind the sluggish DRX was attributed to the sluggish diffusion and pronounced lattice distortion in the HES. Further investigations by the electron back-scattered diffraction (EBSD) established that the discontinuous DRX (DDRX) is the dominant mechanism, while the continuous DRX (CDRX) serves as a secondary, auxiliary mechanism governing the microstructural evolutions.
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