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Stacking fault energy of C-alloyed steels: The effect of magnetism
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.ORCID iD: 0000-0001-5676-418X
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2017 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 122, 72-81 p.Article in journal (Refereed) Published
Abstract [en]

First-principles calculations have been performed to study the effect of C on the stacking fault energy (SFE) of paramagnetic γ-Fe and Fe[sbnd]Cr[sbnd]Ni austenitic steel. In these systems, the local magnetic structure is very sensitive to the volume in both fcc and hcp structures, which emphasizes the importance of the magnetovolume coupling effect on the SFE. The presence of C atom suppresses the local magnetic moments of Fe atoms in the first coordination shell of C. Compared to the hypothetical nonmagnetic case, paramagnetism significantly reduces the effect of C on the SFE. In the scenario of C being depleted from the stacking fault structure or twin boundaries, e.g., due to elevated temperature, where the chemical effect of C is dissipated, we calculate the C-induced volume expansion effect on the SFE. The volume induced change in the SFE corresponds to more than ∼ 50% of the total C effect on the SFE obtained assuming uniform C distribution. © 2016 Acta Materialia Inc.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 122, 72-81 p.
Keyword [en]
Austenitic steels, C-alloyed steel, First-principles theory, Stacking fault energy, γ-Fe, Austenite, Austenitic steel, Calculations, Magnetic moments, Paramagnetism, Supercritical fluid extraction, Alloyed steels, Coordination shells, Elevated temperature, First-principles calculation, Local magnetic moments, Stacking fault energies, Volume expansion, Magnetism
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-195126DOI: 10.1016/j.actamat.2016.09.038ISI: 000389556300007ScopusID: 2-s2.0-84989181037OAI: oai:DiVA.org:kth-195126DiVA: diva2:1048253
Note

Funding Details: VR, Swedish Research Council. QC 20161121

Available from: 2016-11-21 Created: 2016-11-02 Last updated: 2017-01-09Bibliographically approved

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