Effect of shear bands on deformation and recrystallization textures in cold-rolled continuously cast strips of brass

Continuous horizontal strip casting produces a band with the same thickness as that obtained by hot rolling, thus it permits to bypass this operation in the production of the brass sheets. The as-cast structure of strip typic ally consists of two layers of coarse columnar grains which reveal the pron ounced texture fibre {001} < uvw > with a marked preference of the {001}< 1 10 > component. This component enhance the development of the strong C-{211 }< 111 > orientation, which favours the intense mechanical twinning and sub sequent shear banding. It is the purpose of the present work to characteriz e, within the range of moderate and high reductions, the influence of the s hear band local orientation on the evolution of cold-rolling and recrystall ization global textures. Preferred orientations were determined within shea r bands and in the abutting matrix by means of EBSD analysis in the SEM and SAD pole figures measurements with the TEM. From X-ray pole figures, the O DF of global texture has been calculated The conclusions, by comparing loca l with global textures, are drawn that delayed development of the {110}< 11 2 > component of brass type rolling texture is related to the intense defor mation twinning which is associated with the appearence of the strong {211} < 111 > component at 50% of reduction. The dominance of the {011}< 100 > Go ss component in the range of intermediate-to-high reductions is attributed to the extensive shear banding which destroys the twin-matrix lamellae, par allel to the rolling plane. The {236}< 385 > main component of the brass-ty pe recrystallization texture develops with the some delay as the {110}< 112 > component of rolling texture which confirms the 40 degrees < 111 > relat ionships between these two orientations.