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

Effect of Microstructure before Cold Rolling on Texture and Formability of Duplex Stainless Steel Sheet

“…In the phase (a) and (c), both the specimen annealed at 1050 C after hot rolling (a) and the specimen annealed at 1200 C after hot rolling (c) had an -fiber texture. The feature of -fiber in the phase was similar to the results of previous studies, 8,10) but the intensity of the phase texture in the specimen annealed at 1200 C after hot rolling (c) was much lower than that annealed at 1050 C after hot rolling (a). This result suggests that the texture of the phase in DSS cold-rolled and annealed sheet is affected by the initial structure prior to cold rolling.…”

“…Although the decision methods of the initial grain size are different, this is similar to the result obtained by Huang et al 14) from a point of view that the initial structure before rolling has the influence on the recrystallization behavior of the phase in duplex structure. Additionally, there are some reports that the recrystallization progresses when the ratio of phase is high; 10,19) it is guessed that the phase morphology prior to cold rolling affects the local inhomogeneous deformation during cold rolling, the nucleation sites, or the growth of subgrains. 10,14,19) 3.3 Tensile elongations of cold-rolled and annealed sheets Figure 13 shows the relation between the phase morphologies prior to cold rolling and the elongation of final sheets annealed at 1075 C for 30 s. The elongation improved with a coarse grain prior to cold rolling.…”

“…Additionally, there are some reports that the recrystallization progresses when the ratio of phase is high; 10,19) it is guessed that the phase morphology prior to cold rolling affects the local inhomogeneous deformation during cold rolling, the nucleation sites, or the growth of subgrains. 10,14,19) 3.3 Tensile elongations of cold-rolled and annealed sheets Figure 13 shows the relation between the phase morphologies prior to cold rolling and the elongation of final sheets annealed at 1075 C for 30 s. The elongation improved with a coarse grain prior to cold rolling. Although the elongation in the transverse direction was low compared with the elongation in the longitudinal direction, both elongations were improved by a coarse grain prior to cold rolling.…”

“…[4][5][6][7] However, the mechanism is not clear, and there have been few studies on the characteristics of microstructure and texture in hot rolling, cold rolling, and annealing. [8][9][10] In addition, the microstructural evolutions in ( þ ) microduplex stainless steel caused by thermo-mechanical processing, which combines deformation and heat treatment, were investigated. [11][12][13][14][15][16][17][18][19][20][21] Huang et al [14][15][16] showed that no recrystallization of the matrix took place when the initial structure before cold rolling was fine, but recrystallization occurred in the matrix with f111gh011i initial orientation when the initial structure was coarse.…”

Texture and Planar Anisotropy in Lean Duplex Stainless Steel Sheet

“…For DSS, the observation of local shear bands after cold rolling have been reported. 21,22,35,36) Blicharski 36) stated that the formation of shear bands in α matrix was induced by the presence of the γ phase having a high density of deformation twins. The reason why the microstructure after cold rolling of Type 32101 was more heterogeneous than Type 329J4L, is thought to be a high volume fraction of the γ phase and a difference in hardness between the α and γ phases to be mentioned later.…”