Investigation of the Primary Recrystallisation Microstructure of Cold Rolled and Annealed Fe 3% Si Single Crystals with Goss Orientation

Abstract

A silicon steel single crystal with {110}<001> Goss orientation was cold rolled up to 89 % thickness reduction and subsequently annealed. The evolution of the macroscopic cold rolling texture was investigated by x-ray diffraction. Local orientation relationships and the microstructure around and within Goss grains of deformed and annealed samples were analysed using the electron backscatter diffraction (EBSD) technique. During cold rolling a texture consisting of two strong {111}<112> components and a minor {110}<001> Goss component develops. After primary recrystallisation the texture is characterized by a strong Goss component. Goss-oriented grains that remain after high deformation are considered to be the origin for the primary recrystallisation texture.

Recrystallization Textures of Metals and Alloys

“…The relaxed constraints Tayor model, in which shear strains parallel to RD may occur, causes the formation of the {111}<112> orientation [67]. The {111}<112> rolling component is known to lead to the Goss orientation after Rex [66,68]. Dorner et al [68] attributed the transition from the {111}<112> deformation texture to the Goss Rex texture to the fact that the Taylor factor (2.4) of the Goss grains is lower than that (3.7) of the {111}<112> matrix.…”

“…The {111}<112> rolling component is known to lead to the Goss orientation after Rex [66,68]. Dorner et al [68] attributed the transition from the {111}<112> deformation texture to the Goss Rex texture to the fact that the Taylor factor (2.4) of the Goss grains is lower than that (3.7) of the {111}<112> matrix. Dorner et al [69], in their study with 3.2% Si-steel single crystals, also found two types of Goss crystal volumes in 89 % cold-rolled specimen.…”

Irregular or Smooth Grain Boundaries Evolved after Secondary Recyrstallization of Fe&ndash;3%Si Steel

“…In relation to this possibility, Park et al 11) observed that sub-boundaries exist exclusively in abnormally-growing Goss grains using transmission electron microscopy. Also, Dorner et al 12) confirmed the existence of sub-boundaries exclusively within Goss grains after primary recrystallization of a sheet sample reduced 89% by cold rolling of a single crystal of Goss orientation. The solid-state wetting mechanism could successfully explain many puzzling structures such as the formation of island and peninsular grains at the growth front 7,13) and the pancake-shaped growth of Goss grains in highly grain-oriented electrical steel of Fe3%Si.…”

Comparison of the Advantages Conferred by Mobility and Energy of the Grain Boundary in Inducing Abnormal Grain Growth Using Monte Carlo Simulations

“…Moreover, this percentage can be reduced further if the potential AGG grain has sub-boundaries. Experimentally, the sub-boundaries with very low misorientations of 0.04 and 0.09 inside Goss grains in Fe-3%Si steel was observed by Ushigami et al 25) Doner et al 26) also observed very small-angle grain boundaries with misorientation less than 1 within the primary recrystallized Goss grain. And also, Park et al 7) and Ko et al 27) reported the direct evidence of 3-dimensional wetting morphology at the growth front of Goss AGG from serial section images.…”