Stacking fault energies of Mn, Co and Nb alloyed austenitic stainless steels
2011 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 59, no 14, 5728-5734 p.Article in journal (Refereed) Published
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.
Stacking fault energy, First-principles electron theory, Austenitic stainless steels
IdentifiersURN: urn:nbn:se:uu:diva-158598DOI: 10.1016/j.actamat.2011.05.049ISI: 000294091400034OAI: oai:DiVA.org:uu-158598DiVA: diva2:440245