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Precipitation in 25Cr20NiNbN austenitic steel after ageing at 750 degrees C

机译：750°C时效后25Cr20NiNbN奥氏体钢的析出

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The heat-resistant austenitic steel 25Cr20NiNbN (HR3C) has been widely used in super heater and re-heater tubes in ultra-supercritical (USC) boilers. The precipitation processes in the steel are complicated because of its high alloy element contents. Precipitation in a 25Cr20NiNbN steel has been investigated after thermal aging at 750 degrees C for period from 500 to 3000 h. The results indicate that M23C6 carbides generally precipitate along grain boundaries and that the major intragranular precipitates are NbCrN nitrides and M23C6 carbides. More precipitates are observed in the specimens after long term aging treatment: NbCrN nitrides on grain boundaries, as well as Cr3Ni2SiC carbides, have been found in the sample after aged for 2000 h at 750 degrees C. The formation of sigma phase has also been confirmed in the current steel after long term aging based on the results of X-ray diffraction (XRD), SEM and chromogenic methods.
机译：耐热奥氏体钢25Cr20NiNbN（HR3C）已广泛用于超超临界（USC）锅炉的过热器和再热器管中。由于合金元素含量高，钢中的析出过程很复杂。在750℃进行500至3000 h的热老化后，已经研究了25Cr20NiNbN钢中的析出物。结果表明，M23C6碳化物通常沿晶界析出，主要的晶内析出物为NbCrN氮化物和M23C6碳化物。经过长期时效处理后，在样品中观察到更多的沉淀物：在750℃时效2000 h时，在样品中发现了晶界上的NbCrN氮化物以及Cr3Ni2SiC碳化物。还确认了σ相的形成。根据X射线衍射（XRD），SEM和发色方法的结果，对当前钢进行长期时效后的热处理。

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