Influence of the Cold Rolling Reduction on the Texture Development and r-value Anisotropy in Ti-stabilized 18% Cr Ferritic Stainless Steel

Abstract

Ti stabilized AISI 439 type 18% Cr ferritic stainless steel offers an attractive alternative for replacing Ni-containing austenitic steels. The influence of the cold rolling reduction on texture development and the planar anisotropy of Ti-stabilized 18% Cr ferritic stainless steel have been studied in order to find an optimized processing route to obtain improved formability properties. In the present study, both annealed and un-annealed hot strips were given different cold rolling reductions up to 86%, and recrystallization annealed. The recrystallization texture was analyzed by means of XRD. Tensile tests were carried out on cold rolled and annealed samples oriented in seven different directions to the rolling direction to evaluate the planar anisotropy in detail. The mean normal anisotropy r(m), increased with increasing cold reduction for both annealed hot band and un-annealed hot band. The planar anisotropy revealed a behavior related to the development of the (554)[(22) over bar5] recrystallization texture component in the annealed hot band and the (223)[4 (7) over bar2] texture component in the un-annealed hot band, with increasing cold reduction.