Abstract
The initial stage of dynamic recrystallization initiated in steels by a high-current electron beam has been studied using the TEM method. It has been shown that the degree of dynamic recrystallization is dictated by the value of the stacking fault energy γSF. In steels with relatively low values of γSF (15−20 mJ/m2), centers of dynamic recrystallization develop by the mechanism of pair coalescence of subgrains, no matter what the crystalline lattice type is. The increase in γSF up to 35−40 mJ/m2 causes a changeover in the mechanism of multiple subgrain coalescence. At much higher values of γSF, dynamic recrystallization evolves by migration of local regions of large-angle grain boundaries.
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