Abstract
To differentiate the ductile fractures caused by deformation incongruities between phases, 22MnB5 boron steel sheets consisting of diverse bainite-martensite fractions were studied. The microstructural characteristics of each phase in tailor-tempered boron steel were examined in tandem with the ductile fracture morphologies after undergoing varied stress states. A micromechanical model was proposed, including microstructural reconstruction using a 2D representative volume element (RVE) approach and a constitutive formulation of a dislocation density-based strain hardening model. The microstructure-based RVE model can be utilized to study the effects of stress states and the influence of microstructural characteristics on the failure mode of tailor-tempered 22MnB5.
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