Elastic strain energy induced by epsilon martensitic transformation and its contribution to the stacking-fault energy of austenite in Fe–15Mn– x C alloys

Lee, Seung Joon; Han, Jeongho; Lee, Chan Young; Park, Il Jeong; Lee, Young Kook

doi:10.1016/j.jallcom.2014.08.054

Cited by 30 publications

(19 citation statements)

References 48 publications

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“…Figure 1a shows the change in a 0 value determined from XRD peak profiles with the addition of N or C in high-Mn steels. The a 0 value of Fe-15Mn-2Cr-0.6C-xN TWIP steels increased linearly with a slope of 0.064 Å per wt.% N, which is approximately one and a half times greater than the slope of 0.041 Å per wt.% C in Fe-15Mn-(0-0.37)C (wt.%) steels [31].…”

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confidence: 76%

The effect of nitrogen on the stacking fault energy in Fe–15Mn–2Cr–0.6C– x N twinning-induced plasticity steels

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confidence: 76%

The effect of nitrogen on the stacking fault energy in Fe–15Mn–2Cr–0.6C– x N twinning-induced plasticity steels

et al. 2014

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“…Because the three undeformed steels had a γ single phase at room temperature, the a ε and c ε values of the Fe-31Mn (wt.%) steel were calculated using empirical equations for binary Fe-Mn steels 41 . The a ε and c ε values of the Fe-29Mn-0.3C and Fe-25Mn-0.6C (wt.%) steels were determined to be the a ε and c ε values measured using Fe-15Mn-0.37C (wt.%) steel 36 .…”

Section: Methodsmentioning

confidence: 99%

Design for Fe-high Mn alloy with an improved combination of strength and ductility

Lee

Han

Lee

et al. 2017

Sci Rep

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Recently, Fe-Mn twinning-induced plasticity steels with an austenite phase have been the course of great interest due to their excellent combination of tensile strength and ductility, which carbon steels have never been able to attain. Nevertheless, twinning-induced plasticity steels also exhibit a trade-off between strength and ductility, a longstanding dilemma for physical metallurgists, when fabricated based on the two alloy design parameters of stacking fault energy and grain size. Therefore, we investigated the tensile properties of three Fe-Mn austenitic steels with similar stacking fault energy and grain size, but different carbon concentrations. Surprisingly, when carbon concentration increased, both strength and ductility significantly improved. This indicates that the addition of carbon resulted in a proportionality between strength and ductility, instead of a trade-off between those characteristics. This new design parameter, C concentration, should be considered as a design parameter to endow Fe-Mn twinning-induced plasticity steel with a better combination of strength and ductility.

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“…The stacking fault energy values measured for Fe-18Cr-10Mn-0.2Si-0.06C-N 5 and Fe-15Mn-2Cr-0.6C-N 6 alloys using neutron diffraction (ND) and X-ray diffraction (XRD) methods, respectively, increased linearly with interstitial content. These overall increasing trends were also demonstrated with transmission-electron microscopy (TEM) measurements for Fe-12Mn-C, Fe-18Mn-10Ni-C and Fe-18Cr-16Ni-10Mn-N alloys, while a decreasing SFE behaviour was locally observed for Fe-22Mn-C and Fe-15Cr-17Mn-N in the low carbon and nitrogen regions 7 , 8 .…”

Section: Introductionmentioning

confidence: 99%

The behaviour of stacking fault energy upon interstitial alloying

Lee

Koo

et al. 2017

Sci Rep

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Stacking fault energy is one of key parameters for understanding the mechanical properties of face-centered cubic materials. It is well known that the plastic deformation mechanism is closely related to the size of stacking fault energy. Although alloying is a conventional method to modify the physical parameter, the underlying microscopic mechanisms are not yet clearly established. Here, we propose a simple model for determining the effect of interstitial alloying on the stacking fault energy. We derive a volumetric behaviour of stacking fault energy from the harmonic approximation to the energy-lattice curve and relate it to the contents of interstitials. The stacking fault energy is found to change linearly with the interstitial content in the usual low concentration domain. This is in good agreement with previously reported experimental and theoretical data.

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Elastic strain energy induced by epsilon martensitic transformation and its contribution to the stacking-fault energy of austenite in Fe–15Mn– x C alloys

Cited by 30 publications

References 48 publications

The effect of nitrogen on the stacking fault energy in Fe–15Mn–2Cr–0.6C– x N twinning-induced plasticity steels

The effect of nitrogen on the stacking fault energy in Fe–15Mn–2Cr–0.6C– x N twinning-induced plasticity steels

Design for Fe-high Mn alloy with an improved combination of strength and ductility

The behaviour of stacking fault energy upon interstitial alloying

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