Changes of Coercive Force of Steel Samples with Various Ductility Reached by Thermomechanical Processing at Stretching

摘要

The article deals with peculiarities of the changes of the coercive force at uniaxial static tension of structural steel samples depending on the material state (initial or preliminary strengthened). Steel strengthening is carried out by equal-channel angular pressing. Flat steel samples were stretched with an "Instron-1195" testing machine at room temperature. The coercive force was measured by a fluxgate coercimeter at step loading conditions. The analysis was made of combined charts of strain ?s-e? and coercive force H_c dependence on coercive force "H_c-ε" of the steel sample strain. Changes of H_c are explained. The domain structure in steel was analyzed. The influence of the material state on the character of correlation between "σ-ε" and "H_c-ε" is shown.