Oxidation of nickel-based single-crystal superalloys for industrial gas turbine applications
Oxidation of nickel-based single-crystal superalloys for industrial gas turbine applications
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DOI：
10.1016/j.actamat.2010.09.027
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发表时间：
2011-01-01
期刊：
影响因子：
9.4
通讯作者：
Reed, R. C.
中科院分区：
文献类型：
--
作者：
Sato, A.;Chiu, Y-L;Reed, R. C.
研究了用于工业（发电）燃气轮机的三种原型镍基单晶高温合金的抗氧化性。所有合金都含有比大多数现有单晶高温合金更多的Cr，其中两种合金是硅合金。所有合金都是边缘al2o3形成者，在1000℃比900℃时性能更好。显微组织分析表明，在枝晶间区域形成Al2O3层的能力更好，枝晶区域容易发生内部氧化。在所有情况下，形成Cr2O3的外部鳞片，该鳞片与Ta2O5（1000℃）或NiTa2O6（900℃）接触。考虑了已知影响Al2O3结垢速率的因素，开发了一个模型来预测任何给定的合金成分是否会形成连续的Al2O3结垢，这用于合理化这些系统中Al2O3结垢形成对合金成分的依赖，这对合金设计的目的是有用的(C) 2010 Acta Materialia Inc .出版的Elsevier Ltd版权所有
The oxidation resistance of three prototype single-crystal nickel-based superalloys for industrial (electricity generating) gas turbine applications is studied All contain greater quantities of Cr than in most existing single-crystal superalloys, two are alloyed with Si All alloys are found to be marginal Al2O3-formers, with the performance being better at 1000 degrees C rather than 900 degrees C, and when Si is added Microstructural analysis indicates that the ability to form an Al2O3 layer is better in the interdendritic regions, the dendrite regions are prone to internal oxidation In all cases, an outer scale of Cr2O3 is formed which is in contact with either Ta2O5 (at 1000 degrees C) or NiTa2O6 (at 900 degrees C) To explain the results, the factors known to influence the rate of Al2O3 scale formation are considered A model is developed to predict whether any given alloy composition will form a continuous Al2O3 scale This is used to rationalize the dependence of Al2O3 scale formation on alloy composition in these systems It is useful for the purposes of alloy design (C) 2010 Acta Materialia Inc Published by Elsevier Ltd All rights reserved