Impact of stresses and alloying elements on ferrous martensite nanodomains

Eyméoud, Paul; Kandaskalov, Dmytro; Maugis, Philippe

doi:10.1016/j.matlet.2021.131248

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2022

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“…Plastic deformation of Fe-C martensite is known to occur by dislocation glide. Our theoretical investigations suggest that it may also involve a part of nano-twinning [10]. Both mechanisms are expected to interfere with carbon ordering.…”

Section: Discussionmentioning

confidence: 79%

Effect of Mechanical Stress Tensor on Phase Equilibria in Body-Centered Interstitial Alloys: Case of Carbon-Supersaturated Iron

Maugis

2022

J. Phase Equilib. Diffus.

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Solid solutions in Fe-C, Fe-N, Nb-O, Ta-O or W-C systems consist of a body-centered lattice containing C, N or O interstitials in octahedral sites. Among these systems, carbon-supersaturated iron has a major industrial interest. At low temperature, it can be found in the form of ferrite (bcc-Fe) or martensite (bct-Fe and bco-Fe). Based on a mean-field elasto-chemical model of the interstitial-strain interaction, we investigated numerically the thermodynamic stability of the three possible crystal forms. The phase stability depends not only on temperature and solute carbon content but also on the mechanical stress state of the crystal. We computed phase diagrams mapping the equilibrium phase and orientational variant as function of the components of the stress tensor. These maps are intended to help understanding the spatial distribution of orientational variants in martensite nano-crystals and in Cottrell atmospheres around dislocations.

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Section: Discussionmentioning

confidence: 79%