Abstract
The deformation behavior of three tensile deformed high-Mn steels with varying Al contents (0, 1 and 3 wt.%) is discriminated on the basis of their respective critical shear stress of twinning, derived from their respective stacking fault energies (18.1-41.6 mJ/m2) estimated according to x-ray diffraction line profile analyses. The Al-free steel manifested maximum strain hardening rate ~ 3 GPa that gradually dropped with addition of Al. The critical twinning stress, \({\tau }_{c}\), of the steels was estimated as: 246, 348 and 561 MPa. Increasing stacking fault energies lead to an adaptation in deformation mechanism from: \((\gamma \to \varepsilon )\) transformation \(\to\) deformation twinning \(\to\) dislocation plasticity—as was noted from x-ray diffraction and transmission electron microscopy studies. The highest strain hardening observed in Al-free steel was attributed to the presence of \(\varepsilon\)-martensite in the austenite microstructure. The incidences of \(\varepsilon\)-martensite and/or twinning were found to be directly related to the equilibrium width of the overlapping stacking faults. The critical shear stress-based calculations could better explain the adaptation of plasticity mechanisms in Fe-Mn-Al-C steels than the prediction based on the stacking fault energy alone.
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TR and SRD acknowledge the support of Department of Science and Technology, Government of India, for awarding DST/Inspire fellowship.
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Riaz, T., Das, S.R. & Sahu, P. Influence of Al Variation on the Mechanical Properties and Critical Shear Stress of Twinning in Fe-Mn-Al-C Steels. J. of Materi Eng and Perform 32, 1636–1644 (2023). https://doi.org/10.1007/s11665-022-07232-2
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DOI: https://doi.org/10.1007/s11665-022-07232-2