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The ferrite major dynamic softening mechanisms, particularly in duplex microstructures, have long been a matter of debate among steel scientists. It has been shown in the present work that a marked increase in the strain rate at a high temperature leads to a transition in the ferrite softening mechanism in low density steels. In contrast to the current widespread view, ferrite was found to soften...
The stacking fault energy of low density steels is sufficiently high to suppress twin formation thereby the twinning induced plasticity effect is expected to disappear. The present work devotes to address the origin of deformation twinning in a duplex low density steel. The substructure evolution (i.e. formation, refinement, size stabilization and its rotation) provides local areas holding preferred...
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