An Experimental Investigation on Microstructure and Mechanical Property of Asymmetric Warm-Rolled Fe-27Mn-3Si-4Al TWIP Steel

Microstructure, texture and mechanical property of Fe-27Mn-3Si-4Al TWIP steels during asymmetric warm rolling were studied. It was found that asymmetric warm rolling strongly refined the microstructures and affected texture evolution of steels because of an additional shear strain in contrast to the symmetric warm rolling. The complete recrystallization occurred on the upper and central layer of sheet, and Goss and Brass textures was developed into γ-fiber and R-Copper {112} <110> textures when the velocity ratio increased to 1.2. The combination of applied asymmetry rolling at elevated reduction resulted in a high yield strength (706 MPa) due to the enhanced shear deformation on the one hand and a reasonably high elongation (26.3%) on the other hand which was attributable to the grain fragmentation at higher velocity ratio, while the significant enhancement of ductility (30.9%) was achieved by the higher dislocation activation due to the decrease of rolling reduction.