Formability of Sn-containing Ferrite Stainless Steel Sheet

Abstract

The effect of annealing treatment on the deep drawability and ridging resistance in a Sn-containing ferritic stainless steel was studied by average plasticity strain ratio r-value measuring, X-ray diffraction (XRD) and electron back scatter diffraction (EBSD) analysis after carried out tensile tests. The results indicate that the average plastic strain ratio (r-value) increased as the annealing temperature and keeping time increased, which reached up to 1.82 after annealing treated at 900°C for 4min. However, ridges became obvious as the temperature increased. When the annealing temperature increased from 860 to 920°C for 2min, the fraction of the recrystallization texture component of γ-fiber in the center of the tested sheet increased from 40% to 70%, while the root-mean-square deviation of the profile (Rq value) increased from 1.179 to 1.783μm. In the tensile tests of the annealed samples with half-thickness of the sheet, the ridging morphology in the center was more obvious than that on the surface. The experiments show that the inhomogeneous distribution of grain clusters of γ-fiber texture formed during recrystallization in the center layer of the sheet is a significant cause of ridging in the sheet, the textures on the surface distributes homogeneously relatively, which is beneficial to reduce the manifestation of ridging.