Experimental study of the disturbed layer generation during hot rolling contact of aluminum with steel

Effects of rolling passes and forward speed on the generation of disturbed layer on aluminum alloy sheet surfaces were investigated using a hot rolling simulator at forward speeds of −1% and 12% in presence of spraying emulsion. The results showed that at higher forward speed and number of rolling passes, the localized shear deformations become more pronounced on the surface. However, when the two rolling passes were in opposite directions, the localized shear deformations did not stick out, but were embedded into the aluminum surface. The defects generated were representative of the initial stages of the disturbed layer formation.