Experimental characterization and crystal plasticity modeling of dual-phase steels subjected to strain path reversals

This paper is concerned with monotonic and load reversal deformation of four dual-phase (DP) 590, 780, 980, 1180 one martensitic (MS) 1700 steel sheets. While the data are presented for all steels, provided DP 1180. Particularities pertaining to including decreasing hardening rate during forward tension, a linear then non-linear unloading, followed by Bauschinger effect, shift in continuous straining were quantified discussed as function loading history. Moreover, parameters such reloading stress differential, softening stress, ratcheting strain, unloading deviation determined martensite fraction. The interpreted predicted using an elasto-plastic self-consistent (EPSC) crystal plasticity model incorporating anisotropic elasticity, dislocation density based law, slip system backstress law. associated strengths ferrite established. work demonstrated ability modeling account co-dependent nature crystallographic sources caused history-dependent evolution predict not only but also hysteresis plastic response forward-reversal cycles. combination comprehensive experimental results allowed us infer that tradeoff between magnitude per phase volume fraction versus governs subsequent yielding steel, while dissolution dislocations facilitates capturing rates deformation.