Cold Rolling and Recrystallization Textures of High-Purity Iron

Abstract

In order to investigate the effects of grain boundaries on the cold-rolling and recrystallization textures, two samples which had different grain sizes of 40μ and 270μ in diameter, were prepared by using a zone-melted high-purity iron. These samples were hot-forged and hot-rolled to the plates of2mm in thickness. These plates were cold-rolled to the sheets of 0.5 mm in thickness by 75% reduction and annealed isothermally at 500°C or 575°C in salt bath. X-ray pole-figure measurements, optical and electron microscopic observations were made for the specimens of as cold-rolled and as annealed conditions.
Cold rolling texture: In the coarse grain specimen two types of fiber texture exist, one has a ‹111› fiber axis parallel to the sheet normal and another has a ‹110› fiber axis parallel to the rolling direction, and the dominant texture component is {111}‹112›.
In the fine grain specimen, texture has a ‹110› fiber axis parallel to the rolling direction and the major component of the texture is {001}‹110›. In the microscopic observation, continuous change of orientation from {001}‹110› to {111}‹110› is often observed in the whole area of specimen.
Recrystallization texture: In the coarse grain specimen, {110}‹001› texture component is preferred and the texture component of near {111}‹112› coexists.
In the fine grain specimen, {111}‹110› texture component is dominant. At the beginning of recrystallization, {111}‹110› recrystallization nuclei in {001}‹110› matrix are found frequently in electron microscopic observation.