EBSD study of the substructure development with cold deformation of dual phase steel

EBSD measurements were performed on as-received and on cold deformed DP600 plate material in order to characterize the substructure development with mechanical straining. Even in the undeformed material, a slight lattice curvature in the ferrite was observed at the phase boundaries with martensitic grains, while such a curvature was not observed at ferrite-ferrite grain boundaries. Upon mechanical straining, a strong curvature develops predominantly around martensitic grains. At high strains this results in orientation differences of up to 35 degrees within ferritic grains. In contrast to the substructure development in IF steel, no pronounced dislocation walls exist in this DP steel, even after 50% cold rolling reduction. (C) 2009 Elsevier B.V. All rights reserved.