Strength and deformation characteristics of microalloyed steel with the yield point of 500Mpa at impact loading

摘要

The paper analyses strength and deformationcharacteristics of microalloyed (Nb) steel with yield strength R_e> 500Mpa at dynamic impact loading in tension. The experimentswere carried out on bars, which were made of microalloyed steelKODUR E 500 TS. For comparison, experiments were alsoperformed on 12 013.1 and 12 050.1 carbon steel bars. It followsfrom the analysis of the result, that microalloyed steels are lesssensitive than carbon steels to the rate of deformation, due to veryfine grains and probably also due to contents of precipitates in theferrite matrix.