Fe-Al materials for structural applications at high temperatures: Current research at MPIE
Fe-Al materials for structural applications at high temperatures: Current research at MPIE
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DOI：
10.3139/146.110056
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发表时间：
2009-03-01
影响因子：
0.8
通讯作者：
Palm, Martin
中科院分区：
文献类型：
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作者：
Palm, Martin
Fe-Al基材料具有许多特性，这使得它们对于开发新型轻质结构材料非常感兴趣。然而，到目前为止，缺乏高温强度和环境温度下有限的延展性阻碍了这些材料的任何更广泛的应用。最近取得的进展，在一个跨部门的研究计划在马克斯普朗克研究所毛皮Eisenforschung GmbH的审查。基于对物理和热力学性质的充分了解以及对相平衡的仔细分析，已经研究了各种合金系统，这些合金系统提供了在高温下增强Fe-Al基材料的不同机制。通过应用这些机制，已经开发出具有足够强度的Fe-Al基合金用于结构应用，至少在650-800摄氏度之间。对于这些合金，已经证明了诸如轧制和锻造的加工路线。低延展性仍然是一个关键问题，但存在改善延展性的措施，例如通过热机械处理细化微观结构。还表明，铁铝化物不仅在氧化和硫化气氛中显示出上级耐腐蚀性，而且在其它恶劣环境如渗碳气氛和熔融盐下也显示出优异的耐腐蚀性。
Fe-Al-based materials possess a number of properties which make them highly interesting for the development of new light-weight structural materials. However, lack of strength at high temperatures and limited ductility at ambient temperatures so far has hindered any wider application of these materials. Recent progress achieved within an inter-departmental research initiative at the Max-Planck-Institut fur Eisenforschung GmbH is reviewed here. Based on a sound knowledge of physical and thermodynamic properties and careful analysis of the phase equilibria, various alloy systems have been investigated which offer different mechanisms for strengthening Fe-Al-based materials at high temperatures. By applying these mechanisms Fe-Al-based alloys with sufficient strength for structural applications at least between 650-800 degrees C have been developed. For these alloys processing routes such as rolling and forging have been demonstrated. Low ductility is still a crucial issue, but measures exist for improving ductility, e.g. by refining the microstructure through thermo-mechanical treatment. It has also been shown that iron aluminides not only show superior Corrosion resistance in oxidising and sulphidising atmospheres but also in other hostile environments like carburising atmospheres and under molten salts.