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 |
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Format: | Artikel |
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. |
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ISSN: | 1073-5623 1543-1940 |
DOI: | 10.1007/s11661-023-07239-x |