Deformation and Annealing Behavior of Nitrogen Alloyed Duplex Stainless Steels. Part I: Rolling

The deformation behavior, i.e. the microstructure development and the deformation mechanisms in nitrogen alloyed ferritic-austenitic duplex stainless steels were studied by means of microstructure investigations and texture measurements in both phases. By comparison with corresponding single phase bcc and fcc materials and Taylor type deformation texture simulations it was possible to reveal the influence of the complementary phase on deformation of each phase during hot and cold rolling. To determine the effect of nitrogen on the deformation mechanisms the nitrogen content in the investigated steels was varied between 0.15 to 0.62%. The investigations prove that during rolling both phases deform similar to the respective single phase material and that there is a minor influence of the second phase on the deformation mechanisms due to the morphological constraints of the typical microstructure in rolled duplex materials.