Effect of Cold Silicon by Grooved Rolls on Internal Strain of 3% Silicon Steels

Abstract

Generally, the higher the residual strain which is introduced by rolling, the more effective the development of (100) recrystallization in 3% silicon steels. In order to confirm this effect and to clarify the mode of deformation involved, an experiment was conducted on work hardening by rolling between grooved rolls.
The experimental results are as follows.
(1) As compared to ordinarily cold rolling, internal strains of about 1.3-1.5 times were obtained by groove rolling and succeeding smooth rolling.
(2) Grooved rolled specimens generally exhibit far greater hardness in their center than on the surfaces. This is due to irregular deformation from groove rolling which induces extensive internal structural change.
(3) As compared to ordinarily cold rolled steels, cold groove-rolled specimens exhibit considerable work hardening by the following rolling on the flattener of a smoothing roll. This is due to grooved-roll protrusions wedged into the matrix under flattener pressure by that is termed the wedging action.