Study of the interplay between banding and the work hardening behaviour in a dual phase steel with improved formability

This work outlines how a cellular automaton model was used to design the processing parameters used to suppress banding in the steel, despite the presence of macro-segregation. Whilst it was possible to suppress the centre-line band due to macro-segregation, slight banding was still evident due to the interdendritic micro-segregation. The results show a significant reduction in tensile strength in banded steels for a similar level of ductility which is the result of a reduced work-hardening capacity. Steels with a high degree of banding do not show the extra transformation work contribution due to the more dominant anisotropic effect of martensite bands on the work-hardening of ferrite.