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Carbide transformation in carburised zone of 25Cr35NiNb+MA alloy after high-temperature service

机译：25Cr35NiNb + MA合金高温处理后渗碳区的碳化物转变

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摘要

Microstructure evolution due to carburising of a 25Cr35NiNb+MA ethylene pyrolysis furnace tube was investigated after service for approximately 4 years. The microstructure of 25Cr35NiNb+MA alloy was examined by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) equipped with energy-dispersive X-ray spectroscopy and high-resolution transmission electron microscopy (TEM). The results revealed that M23C6 carbides of the 25Cr35NiNb+MA alloy had coarsened and transformed to M7C3 carbides with a heavily faulted structure during carburising. The content of M7C3 carbide increased closer to the inner wall. A large number of dislocations had been observed surrounding the carbides and some formed dislocation walls. The carbide transformation mechanism and the effect of the dislocation walls are discussed.
机译：使用25年后，研究了25Cr35NiNb + MA乙烯热解炉管渗碳引起的组织演变。通过X射线衍射（XRD），配备能量色散X射线光谱的场发射扫描电子显微镜（FESEM）和高分辨率透射电子显微镜（TEM）检查了25Cr35NiNb + MA合金的显微组织。结果表明，在渗碳过程中，25Cr35NiNb + MA合金的M23C6碳化物已粗化并转变为具有严重缺陷结构的M7C3碳化物。 M7C3碳化物的含量在靠近内壁处增加。在碳化物和一些形成的位错壁周围观察到大量的位错。讨论了碳化物的转变机理和位错壁的影响。

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