Textures Development in Cold-Worked Ferrite-Pearlite Steels by Drawing to Moderate Reductions

摘要

The authors present textures of 0.18 and 0.43% C steels developed during a single pass through different dies by drawing to a maximum of 23.9% and 27.6% reduction in diameter, respectively. The orientation density function (ODF) were estimated from pole figures (X-ray diffraction) for different drawing levels at 1/2 diameter. For both steels, the ODF show a low level texture even for the highest deformation levels. The 0.18% C steel exhibits higher crystal orientation than the 0.43% C steel. The study of the crystal orientation density, f(g), reveals an increase of the density values for the components with <110> parallel to the drawing direction. The calculated volume fraction of each texture component, Fv, indicates an increase of the α-fibre, while γ-fibre remains constant and ε-fibre tends to decrease. The analysis of texture evolution with the highest f(g) in the ODF obtained at the surface and at the 1/2 diameter in 0.18% C steel with the maximum drawing level indicates meaningful changes in intensity and also in the peaks localization, due to the presence of an inhomogeneous texture produced by plastic anisotropy across depth level of the drawn profile.