期刊
ACTA MATERIALIA
卷 59, 期 14, 页码 5728-5734出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.05.049
关键词
Stacking fault energy; First-principles electron theory; Austenitic stainless steels
资金
- Swedish Research Council
- Swedish Foundation for International Cooperation in Research and High Education
- European Research Council
- Swedish Steel Producers' Association
- Carl Tryggers Foundation
- Hungarian Scientific Research Fund [OTKA 84078]
- China Scholarship Council
- MoST of China [2011CB606404]
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. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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