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Stacking fault energies of Mn, Co and Nb alloyed austenitic stainless steels
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2011 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 59, no 14, 5728-5734 p.Article in journal (Refereed) Published
Abstract [en]

The alloying effects of Mn, Co and Nb on the stacking fault energy (SFE) of austenitic stainless steels, Fe-Cr-Ni with various Ni contents, are investigated via quantum-mechanical first-principles calculations. In the composition range (c(Cr) = 20%, 8 <= c(Ni) <= 20%, 0 <= c(Mn), c(Co), c(Nb) <= 8%, balance Fe) studied here, it is found that Mn always decreases the SFE at 0 K but increases it at room temperature in high-Ni (c(Ni) greater than or similar to 16%) alloys. The SFE always decreases with increasing Co content. Niobium increases the SFE significantly in low-Ni alloys; however, this effect is strongly diminished in high-Ni alloys. The SFE-enhancing effect of Ni usually observed in Fe-Cr-Ni alloys is inverted to an SFE-decreasing effect by Nb for c(Nb) greater than or similar to 3%. The revealed nonlinear composition dependencies are explained in terms of the peculiar magnetic contributions to the total SFE.

Place, publisher, year, edition, pages
2011. Vol. 59, no 14, 5728-5734 p.
Keyword [en]
Stacking fault energy, First-principles electron theory, Austenitic stainless steels
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-158598DOI: 10.1016/j.actamat.2011.05.049ISI: 000294091400034OAI: oai:DiVA.org:uu-158598DiVA: diva2:440245
Available from: 2011-09-12 Created: 2011-09-12 Last updated: 2017-12-08Bibliographically approved

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Johansson, BörjeVitos, Levente

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