Derivation and Variation in Composition-Dependent Stacking Fault Energy Maps Based on Subregular Solution Model in High-Manganese Steels
Derivation and Variation in Composition-Dependent Stacking Fault Energy Maps Based on Subregular Solution Model in High-Manganese Steels
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DOI：
10.1007/s11661-009-0050-8
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发表时间：
2009-12-01
影响因子：
2.8
通讯作者：
Bleck, W.
中科院分区：
文献类型：
--
作者：
Saeed-Akbari, A.;Imlau, J.;Bleck, W.
采用亚规则溶液热力学模型计算了碳含量为0 ~ 1.2wt%的高锰钢（10 ~ 35wt%）的层错能。基于这些计算，组成依赖图显示的区域不同的SFE值所提到的组成范围。这些图被称为SFE图。此外，通过增加温度、铝含量和奥氏体晶粒尺寸观察到SFE图的变化。这些变化既表现为随温度升高和铝含量的增加而增加的超临界流体萃取率，也表现为随晶粒尺寸的增大而减小的超临界流体萃取率。在这些图中，20 mJ/m（2）的SFE值被引入作为应变诱发马氏体形成的上限。通过数学方法评估由温度和铝含量增加引起的该极限的变化，以找出避免转变所需的锰的最小量。通过介绍SFE的等碳图和等锰图，可以看出，当添加到具有较低锰含量的钢中时，温度和铝对SFE具有更大的影响。随着铝含量的增加，其对SFE的影响不断减小。
A subregular solution thermodynamic model was used to calculate the stacking fault energies (SFEs) of high-manganese (10 to 35 wt pct) Steels with carbon contents of 0 to 1.2 wt pct. Based on these calculations, composition-dependent diagrams were developed showing the regions of different SFE values for the mentioned composition range. These diagrams were called SFE maps. In addition, variations in the SFE maps were observed through increasing the temperature, aluminum content, and austenite grain size. These changes were seen either as all increasing trend of SFE caused by raising the temperature and aluminum content, or as a decreasing behavior caused by increasing the grain size. The SFE value of 20 mJ/m(2) within these diagrams was introduced as the upper limit for the strain-induced martensite formation. The variations in this limit caused by increasing the temperature and aluminum content were mathematically evaluated to find out the minimum amount of manganese that was required to avoid the transformation. By introducing the isocarbon and isomanganese diagrams of the SFE, it was seen that both temperature and aluminum had a greater effect on the SFE when added to the steels with the lower manganese contents. Moreover, by adding more aluminum to the composition of the high-manganese steels, its Influence on the SFE decreased continuously.