The Influence of Warm Rolling on Microstructure and Deformation Behavior of High Manganese Steels

Abstract

In this work, a Fe23Mn0.3C1Al high manganese twinning-induced plasticity (TWIP) steel is subjected to varying warm rolling procedures in order to increase the yield strength and maintain a notable ductility. A comprehensive material characterization allows for the understanding of the activated deformation mechanisms and their impact on the resulting microstructure, texture, and mechanical properties. The results show a significant enhancement of the yield strength compared to a fully recrystallized Fe23Mn0.3C1Al steel. This behavior is mainly dominated by the change of the active deformation mechanisms during rolling. Deformation twinning is very pronounced at lower temperatures, whereas this mechanism is suppressed at 500 °C and a thickness reduction of up to 50%. The mechanical properties can be tailored by adjusting rolling temperature and thickness reduction to desired applications.

Physical Metallurgy of High Manganese Steels

“…This Special Issue gathers manuscripts from internationally recognized researchers with stimulating new ideas and original results. It consists of fifteen original research papers, seven contributions focus on steels with manganese content above 12% mass [4][5][6][7][8][9][10], whereas eight deal with alloys having less manganese [11][12][13][14][15][16][17][18].…”

“…The most probable application of HMnS is anticipated to be as sheet products. Therefore, profound understanding of the material behaviour during thermo-mechanical processing is of eminent importance and has been addressed in the contributions by Torganchuk et al [4], Haupt et al [5], Oevermann et al [6], and Quadfasel et al [7]. As has been shown in [4], the combination of severe cold rolling (86% thickness reduction) and annealing promotes very fine-grained HMnS.…”

“…The combination of fine recrystallized grains, high carbon content and minor fraction of non-recrystallized grains resulted in a remarkable combination of mechanical properties, i.e., yield strength (YS) of 1 GPa, ultimate tensile strength (UTS) of 1.65 GPa and a total elongation (ε tot ) of 40%. Haupt et al [5] took advantage of the dependence of the SFE on temperature. During rolling at elevated temperatures (up to 500 • C), the contributions of mechanically induced twinning and dislocation slip were adjusted in order to tailor the property profile at room temperature.…”

Mechanical Performance and Microstructural Evolution of (NiCo)75Cr17Fe8Cx (x = 0~0.83) Medium Entropy Alloys at Room and Cryogenic Temperatures

“…It should be noted that the hardening rates of carbon-free (NiCo) 75 Cr 17 Fe 8 and low carbon (NiCo) 75 Cr 17 Fe 8 C 0.34 alloy even increased with strain in the strain range of 0.1-0.6 at 77 K. The plateau or hump of strain hardening rate in Figure 6 suggests the activation of a new deformation defect which can act as both deformation obstacles and deformation carriers. The increase of strain hardening rate with strain has been observed in various twin-induced plasticity (TWIP) [32][33][34][35] and transformation-induced plasticity (TRIP) alloys [34]. The excellent strength and ductility of (NiCo) 75 Cr 17 Fe 8 and low carbon (NiCo) 75 Cr 17 Fe 8 C 0.34 alloy in Figure 5 is attributed to the increase of strain hardening rate with strain in the strain range of 0.1-0.6 at 77 K. The tensile strength increased significantly up to~1400 MPa in carbon-containing (NiCo) 75 Cr 17 Fe 8 C 0.83 with a decent ductility of 106.…”

On Mechanical Properties of Welded Joint in Novel High-Mn Cryogenic Steel in Terms of Microstructural Evolution and Solute Segregation

“…These results suggest that the solute segregation is an important factor affecting the quality of welded joint (WJ) in austenitic steel. For a long time, studies on high-Mn austenitic have steel mainly focused on the applications of automotive industry for its excellent strain hardening capability [15]. Consequently, studies on welding of high-Mn austenitic steel are mainly related to electrical resistance welding (ERW) [16], laser welding [17] and friction stir spot welding (FSSW) [18], which have a small and concentrated welding heat input.…”