Mechanism of Separation of A Low-carbon Low Alloy Steel Control-Rolled in Austenite and Ferrite Two Phase Regions

Abstract

The purpose of this paper is to understand controlling factors of separations parallel to the rolling plane developed in charpy specimens when rolling is extended in α+γ two phase regions.
Main results are as follows:
1) Separation were found to be enhanced by the development of {100} and {111} textures, the formation of large texture bandings consisted of a group of ferrite grains having a common crystallographic orientation, and the presence of the local plastic flow at the notch root preceding complete fracture.
2) Separations were found to increase the area of intergranullar fracture as the texture developes.
On the basis of these results it is suggested that separations may be formed by the initiation of the crack along the interface between {100} bandings and {111} bandings resulting from the anisotropic plastic flow of these bandings.