Microstructural characterization of high-manganese austenitic steels with different stacking fault energies

Characterization of Evolution of Microscopic Stress and Strain in High-Manganese Twinning-Induced Plasticity Steel

“…Therefore, the effect of SFE on the microstructure, specifically the crystallite size, during the deformation of TWIP steels has been also studied by analyzing line broadening in X-ray diffraction patterns. 31) These results showed that the stacking fault probability is correlated with the crystallite sizes of different TWIP steels.…”

“…On the other hand, although the mechanical twins were not observed in grains with a relatively small Schmid factor such as grain G, it is known that the plastic deformation by dislocation slip was dominant in such grains. 31) It is noted that there are some local misorientations in the matrix, as shown in Fig. 4(b), implying that slips due to dislocations as well as twinning occur in the matrix.…”

“…[1][2][3][4] As the mechanical properties of these steels are often related with the formation of mechanical twins by deformation, these steels are called twinning-induced plasticity (TWIP) steels. The mechanical properties, [5][6][7][8][9][10][11][12][13][14][15] deformation mechanisms associated with stacking fault energies (SFE), [16][17][18][19][20][21][22][23] the thermodynamic properties, 24,25) and the microstructure [26][27][28][29][30][31] of the TWIP steels have been extensively investigated. Since a stacking fault may act as an embryo of a twin, the SFE or the chemical composition of the alloying elements, such as manganese, carbon, silicon, and aluminum, is an important factor affecting the twinning processes caused by plastic deformation.…”

Microscopic Stress and Strain Evolved in a Twinning-Induced Plasticity Fe-Mn-C Steel

“…4 shows a contour plot of the Schmid factors for twin and slip deformations in the fcc structure. The orientation of the maximum Schmid factor for twinning differs from that for slip deformation, since the shear directions of twinning and slip deformation are [121] and [110], respectively [8]. This contour plot indicated that twin formation easily occurs in grains with an orientation near [101]-[111] toward the tensile direction, and that the slip deformation easily occurs in grains with other orientations [8].…”

“…The orientation of the maximum Schmid factor for twinning differs from that for slip deformation, since the shear directions of twinning and slip deformation are [121] and [110], respectively [8]. This contour plot indicated that twin formation easily occurs in grains with an orientation near [101]-[111] toward the tensile direction, and that the slip deformation easily occurs in grains with other orientations [8]. In this study, the stress and strain distributions were simulated for the microstructure shown in Fig.2, in which the tensile direction of the sample was horizontal and the sample was deformed by 3.4%.…”