Manipulation of the Stacking Fault Energy of a Medium-Mn Steel Through Temperature and Hierarchical Compositional Variation

Neutron diffraction was used to interrogate the temperature-dependent deformation response of a medium-Mn steel. Through in situ measurements of phase content, the deformation response at 298 K was found to consist of phase transformation of the γ -austenite to ε - and α -martensite (TRIP). When str...

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Veröffentlicht in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2024, Vol.55 (1), p.161-172
Hauptverfasser: Field, D. M., Magagnosc, D. J., Hornbuckle, B. C., Lloyd, J. T., Limmer, K. R.
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Sprache:eng
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Zusammenfassung:Neutron diffraction was used to interrogate the temperature-dependent deformation response of a medium-Mn steel. Through in situ measurements of phase content, the deformation response at 298 K was found to consist of phase transformation of the γ -austenite to ε - and α -martensite (TRIP). When strained above 423 K, twinning-induced plasticity (TWIP) became the dominant deformation behavior. At intermediate temperatures, mixed-mode deformation was observed. The various deformation responses are explained relative to the calculated temperature-dependent stacking fault energy curve. For stacking fault energies ≤ 15 mJ/m 2 , phase transformation associated with stacking fault generation was observed. When the stacking fault energy was ≥ 22 mJ/m 2 , twinning was recorded. Between these values, a mixed-mode deformation was noted with both twins and ε -martensite being identified; the mixed-mode response is due to the chemical and microstructural inhomogeneity of the alloy. This investigation works to clarify the effect of temperature on medium-Mn stacking fault energy and the associated deformation responses within a single alloy class.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-023-07239-x