Microstructure evolution in dual-phase stainless steel during severe deformation

Regularities of Deformation Microstructures in Ferritic Stainless Steels during Large Strain Cold Working

“…The processing details are explained elsewhere. [24][25][26] The main results were obtained by using unidirectional deformation. Namely, the large strain cold working was carried out by bar rolling to 7.8 mmϫ7.8 mm square bars followed by swaging from f7.0 mm to about f0.5 mm.…”

“…3 for various steels. [24][25][26] Early deformation is characterized by a rapid drop of the transverse (sub)grain size. This is consistent with a work hardening taking place right after beginning the plastic flow, when the dislocation density readily increases that leads to formation of cell substructure followed by the development of many dense dislocation walls subdividing original grains.…”

“…Recently, bar rolling followed by swaging and multiaxial forging were utilized as methods of severe deformation to process several stainless steels. [24][25][26] After sufficiently large strains, the submicrocrystalline structures were developed in the treated samples. The aim of the present paper is to summarize briefly our late results on severe deformations and to reveal the peculiarities of the structural mechanism responsible for the development of strain-induced submicrocrys-…”

Crystallographic Texture of Warm Caliber-rolled Low Carbon Steel

“…Similarly, even if such steel is compressed alternately from two directions, such as in the caliber rolling, the -fiber texture is produced around center and quarter. 20,22) However, the texture around the corner is random regardless of " eq , and the texture at the site of the side has a preferred orientation of RD == h113i with increasing " eq . In other words, in the present caliber rolling, the site related to the evolution of the texture can be classified into three areas.…”

“…Furthermore, Figure 8 shows that the -fiber texture, which is typical of recrystallized rolled ferritic steels, and the ND == h101i fiber, which is a shear texture, do not appear in the present caliber rolling. This means that the structural changes during severe deformations at warm working temperatures are associated with the strain-induced continuous reaction 2,[18][19][20] and that no large shear deformation, as is usually observed in sheet rolling, is introduced near the surface in a caliber-rolled bar.…”