Abstract: The present work aimed to find an appropriate calculation model for the stacking fault energy (SFE) of Fe-Mn-Al-C low-density steels so as to facilitate the relevant research upon the SFE of this representative species of high-strength steel. We discussed and depicted the SFE calculation model established based on the pertinent thermodynamics theory and the experimental met-hods for determining SFE. Based on the Olson-Cohen thermodynamics model, we then calculated the SFE of some Fe-Mn-Al-C steels which had been determined in previous works to evaluate the reliability of Olson-Cohen model, and subsequently carried out the inverse correction for main parameters in the model. The computer-assisted theoretical calculation results of the SFE for the series of Fe-(10-30)Mn-(0-12)Al-(0-1.2)C (wt%) low-density steels showed that more Mn, Al or C elements will all lead to larger SFE. SFE’s sensitivity toward Al is the highest and the influence of various elements are γSFE,Al>γSFE,Mn>γSFE,C. In addition, under high temperature range (300-1 000 K) the SFE increases at a higher rate compared with low temperature range (0-300 K).
章小峰, 杨浩, 李家星, 阚中伟, 施琦, 黄贞益. 基于热力学理论的Fe-Mn-Al-C系低密度钢层错能计算模型[J]. 材料导报, 2018, 32(16): 2859-2864.
ZHANG Xiaofeng, YANG Hao, LI Jiaxing, KAN Zhongwei, SHI Qi, HUANG Zhenyi. The Stacking Fault Energy (SFE) Calculation Model for Fe-Mn-Al-C Low-density Steels Based on Thermodynamics Theory. Materials Reports, 2018, 32(16): 2859-2864.
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2018, Vol. 32 
