Effect of microstructure before cold rolling on texture and formability of duplex stainless steel sheet

Abstract

The evolution of the microstructure and texture of type 329J4L duplex stainless steel (DSS) sheet during cold rolling and annealing were examined, and the effect of the initial microstructure before cold rolling on texture and formability was investigated. The texture of the α phase in the hot-rolled and annealed sheet had a strong α-fiber texture, and this was stable even in cold-rolled and annealed sheet. However, in the case of a coarse α grain caused by high-temperature annealing prior to cold rolling, the α-fiber texture and colony with 〈100〉 // ND orientation in the a phase were reduced in cold-rolled and annealed sheet. This control of the α-fiber texture in the α phase in cold-rolled and annealed sheet improved the elongation, r- value, and ridging characteristics. These results showed that the texture and the formability of type 329J4L DSS cold-rolled and annealed sheet depended on the texture of the α phase and the initial α phase morphology before cold rolling. ©2010 The Japan Institute of Metals.