A dislocation density-based model for the work hardening and softening behaviors upon stress reversal

Abstract The mechanical behaviours of microalloyed and low-carbon steels under strain reversal were modelled based on the average dislocation density taking into account its allocation between cell walls interiors. proposed model reflects effects dislocations displacement, generation new their annihilation during metal-forming processes. back stress is assumed as one internal variables. value initial was calculated using two different computational methods, i.e. first tensor second gradient model. methods calculating subjected to a comparative analysis. For microstructural analysis, high-resolution electron backscatter diffraction (EBSD) microscopy utilized. calculation results compared with forward/reverse torsion tests. As result, good effectiveness applied methodology demonstrated. Finally, analysis distributions an effect path change performed.