With the electron backscattered diffraction (EBSD) technique the non-uniform microstructure forming under
conditions of inhomogeneous dynamic deformation were investigated by the example of explosively bonded steel
plates. The layers with fine-grained recrystallized structure as well as deformation-induced fragmented
structure are distinguished within the narrow interface zone undergone intense deformation. The study was
focused on the mechanism of the fragmented structure formation. Within the layers subjected to mediate deformation,
the deformation-induced branching boundaries, along which the misorientation gradually changes from the angles
above 30° to the ones below a tolerance angle of 2°, have been examined. The development of such
boundaries was shown to demonstrate early stage of the fragmentation process.
Keywords: steel; steel plates; inhomogeneous dynamic deformation; microstructure.
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