On the influence of strain rate and deformation temperature on the peculiarities of plastic flow in vanadium-alloyed austenitic steel with high interstitial content.

The influence of test temperature in the range from –60 to 60°C and strain rate from 1×10^–4 to 1×10⁻² s⁻¹ on tensile mechanical properties and peculiarities of a plastic flow has been experimentally investigated using the vanadium-alloyed ultrahigh-interstitial austenitic Fe-22Cr-26Mn-1.3V-0.2Ni-0.7C-1.2N (mass %) steel specimens subjected to a 1-hour solid-solution treatment at temperature of 1200°C. It has been established that the decrease in deformation temperature and the increase in strain rate does not change the dominating deformation mechanism of the steel— dislocation slip—but increase a planarity of a dislocation arrangement and promote mechanical twinning as the additional deformation mechanism. The ultrahigh-interstitial steel demonstrates striking temperature and strain rate dependencies of a yield strength in considered loading conditions. [ABSTRACT FROM AUTHOR]