Origin of the deformation microstructure in if steel after medium cold rolling reductions

Abstract

In this paper TEM work on the formation of dislocation meshes, cells, microbands and shear bands is summarized. Following this the results of a sequential rolling experiment in which the development of microstructure is followed from the strain free to 50% rolling condition. Crystals behave according to three generic types. Grains with an orientation close to α, deform homogenously without much rotation. Grains close to {111}<110> are also stable, and can have either α or γ microstructure. Others seem to be able to deform homogenously up to a certain strain, hence resembling α grains, and then rotate to γ, forming typical γ microstructures.