Evolution of the brass microstructure during rolling in relief and smooth rolls

Abstract

One of the most promising technologies for rolling thick-sheet metal, during which shear deformations are realized both in the longitudinal and transverse directions, is rolling in rolls with a relief surface in the form of annular channels that form trapezoidal protrusions and depressions that alternate one after another along the entire length of the barrel. At the same time, a relief with an unequal ratio of the protrusion to the depression is applied to the rolls. In this case, the gap between the rolls in all directions retains the value of the distance between the rolls, i.e. when deforming in these rolls, only the net shear scheme is implemented. This method of applying a relief surface to the rolls allows to save metal, reduce the required deformation force and labor and energy costs due to the reduced number of metal passes through the working stands. During the micro structure study of brass blanks rolled on existing and proposed technologies it was revealed that the original grain after the traditional deformation process is reduced from 22 µm to 9 µm, and after the proposed technology it is reduced from 22 µm to 3 µm.