Mosecker Linda, Saeed-Akbari Alireza
Department of Ferrous Metallurgy, RWTH Aachen University, Intzestrasse 1, D-52072 Aachen, Germany.
Laboratory of Metal Physics and Technology, Swiss Federal Institute of Technology (ETH) Zurich, Wolfgang-Pauli-Strasse 10, CH-8093 Zürich, Switzerland.
Sci Technol Adv Mater. 2013 Jun 19;14(3):033001. doi: 10.1088/1468-6996/14/3/033001. eCollection 2013 Jun.
Nitrogen in austenitic stainless steels and its effect on the stacking fault energy (SFE) has been the subject of intense discussions in the literature. Until today, no generally accepted method for the SFE calculation exists that can be applied to a wide range of chemical compositions in these systems. Besides different types of models that are used from first-principle to thermodynamics-based approaches, one main reason is the general lack of experimentally measured SFE values for these steels. Moreover, in the respective studies, not only different alloying systems but also different domains of nitrogen contents were analyzed resulting in contrary conclusions on the effect of nitrogen on the SFE. This work gives a review on the current state of SFE calculation by computational thermodynamics for the Fe-Cr-Mn-N system. An assessment of the thermodynamic effective Gibbs free energy, [Formula: see text], model for the [Formula: see text] phase transformation considering existing data from different literature and commercial databases is given. Furthermore, we introduce the application of a non-constant composition-dependent interfacial energy, б , required to consider the effect of nitrogen on SFE in these systems.
奥氏体不锈钢中的氮及其对堆垛层错能（SFE）的影响一直是文献中激烈讨论的主题。直到如今，还不存在一种能广泛应用于这些体系中各种化学成分的、被普遍接受的SFE计算方法。除了从第一原理到基于热力学的方法所使用的不同类型模型外，一个主要原因是普遍缺乏这些钢的实验测量SFE值。此外，在各自的研究中，不仅分析了不同的合金体系，还分析了不同的氮含量范围，导致关于氮对SFE影响的结论相互矛盾。本文综述了通过计算热力学对Fe-Cr-Mn-N体系进行SFE计算的现状。考虑来自不同文献和商业数据库的现有数据，对用于[公式：见原文]相变的热力学有效吉布斯自由能[公式：见原文]模型进行了评估。此外，我们介绍了应用非恒定成分依赖的界面能б来考虑氮对这些体系中SFE的影响。
