Investigation of the Development of Cold-rolling and Annealing Textures in SUS304 Austenitic Stainless Steel

Abstract

The cold-rolling and annealing textures of SUS304 stainless steel strip has been investigated. The results obtained are as follows.1)The deformation texture of a strip rolled at room temperature can be described as a mixture of the ferritic type (α' martensite) and the brass type (retained austenite).2)The α' martensitic phase transforms reversely into austenitic phase at 700°C.The two components {111}<112>α' and {100}<011>α' can be related to the {110}<112> γ brass type texture by Kurdjumov-Sachs and Nishiyama relations, and the {112}<110>α' can be related to the {110}<001>γ.3)The recovery of internal stress accumlated by cold-rolling is faster in the {112} γ and {113} γ components than in the {110} γ component. The {110}<112> γ component of the deformation texture decreases for the annealing temperature above 800°C. The strong components of annealing texture above 900°C are consisted mainly of the near {112} <111> γ and near {113}<332> γ. These results suggest that the grains of the {112}{113} components recrystallize at lower temperature and absorb eventually yet unrecrystallized region of the {110} component.These structure changes during recrystallization process were confirmed by transmission electron microscopy.