EFFECTS OF CARBON AND MANGANESE ON THE RECRYSTALLIZATION TEXTURE OF COLD-ROLLED STEEL SHEET

In order to clarify the effect of carbon and manganese on the recrystallization texture formation of low carbon steel sheets, the change in texture and microstructure during cold-rolling and annealing have been investigated. A strong{111} recrystallization texture component forms in interstitial atom-free steels being nearly independent of manganese content, the grain size of hot bands, and the heating rate of annealing. However, in a 0.21% manganese steel containing solute carbon prior to cold-rolling, the {111} recrystallization texture component is seriousely decreased with increases in the grain size of hot bands and the heating rate of annealing. By measurement of the electrical resistivity, the solute carbons making complex with manganese atoms are found to be almost absent during the recovery process between 400 and 480-degrees-C in a 0.21% manganese steel. During cold rolling, the slip rotations into the end stable {211} [011] + 5-degrees orientations, which are assumed to form the near {111} recrystallization texture component, are suppressed by the solute carbon coexisting with manganese atom as C-Mn complex and increment of hot bands grain size. Therefore, nuclei of {110} [001] are considered to grow more preferentially than those of {554} [225] in the steel containing solute carbon and manganese.