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Microstructure influence on creep properties of heat-resistant austenitic alloys with high aluminum content
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2020-03-22 , DOI: 10.1016/j.msea.2020.139276
A. Facco , M. Couvrat , D. Magné , M. Roussel , A. Guillet , C. Pareige

This work focusses on the link between microstructure and creep properties for heat-resistant austenitic alloys with high aluminum content (3–5 wt %). An emphasis was put on the coupling of thermodynamic simulations, microstructural characterizations by scanning electron microscopy and transmission electron microscopy, and creep testing. The phase predictions performed by the calculation of phase diagrams method are in good agreement with the observed microstructure after creep at 1000 °C and 1050 °C. Correlation between creep properties and microstructure characterizations at 1000 °C and 1050 °C revealed that NiAl and α’ (chromium-rich base centered cubic phase) phases are deleterious for the creep properties at service temperature. Several high Al-content alloys are selected in order to replace the chromia-forming alloys standardly used in cracking furnaces.



中文翻译:

显微组织对高铝含量耐热奥氏体合金蠕变性能的影响

这项工作的重点是铝含量高(3-5%)的耐热奥氏体合金的微观结构与蠕变性能之间的联系。重点放在热力学模拟,通过扫描电子显微镜和透射电子显微镜以及蠕变测试的微观结构表征的耦合上。通过计算相图方法进行的相预测与在1000°C和1050°C蠕变后观察到的微观结构非常吻合。在1000°C和1050°C下蠕变性能与微观结构表征之间的相关性表明,NiAl和α'(富铬基中心立方相)相对于使用温度下的蠕变性能有害。

更新日期:2020-03-22
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