Formation of recrystallization texture and its effect on deep drawability for high-purified ferritic stainless steel by two step cold rolling

Abstract

For working out the approach of acquiring low planar anisotropy while achieving high ridging resistance and r-value, during two step cold rolling processes with different total reductions the texture evolution and corresponding mechanism were investigated for ferritic stainless steel. During cold rolling, the crystallites having orientations near {111} 〈112〉 and Goss were induced by shear bands and with further deformation Goss orientation tended to rotate towards more stable {111} 〈112〉. During subsequent annealing, these crystallites induced the recrystallized nuclei and {111} 〈112〉 nuclei consumed preferentially the adjacent matrixes, generating the γ-fiber recrystallization texture having the main component of {111} 〈112〉. With increasing total cold rolling reduction, the γ-fiber recrystallization textures were gradually intensified and band-like grain colonies having approximate r-value and those having variant with ε23 of same sign became more obvious and their distribution more uneven, the average r-value and ridging resistance exhibited a monotonous upward and downward trend, respectively, and the planar anisotropy of r-value first deteriorated and then improved and reached lowest value at 90 %. Considering acceptable ridging resistance in practical application, the excellent deep drawability can be acquired at the total reduction of 90 %.

Keywords

• Ferritic stainless steel
• Deep drawability
• Texture evolution
• Grain colony distribution
• Recrystallization texture formation
• Cold rolling