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首页> 外文期刊>Journal of Materials Engineering and Performance >Identification of the Precipitates by TEM and EDS in X20CrMoV12.1 After Long-Term Service at Elevated Temperature
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Identification of the Precipitates by TEM and EDS in X20CrMoV12.1 After Long-Term Service at Elevated Temperature

机译：高温长期使用后，通过TEM和EDS在X20CrMoV12.1中鉴定出沉淀物

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摘要

The crystal structures, morphologies, and compositions of carbides in a martensitic pipe steel of type X20CrMoV12.1 after long-term service at 550 deg C have been carefully investigated using transmission electron microscopy (TEM) and dispersive x-ray spectrometry (EDS). Most of carbides are M_(23)C_6. the M_(23)C_6 particles in prior austenite grains and in martensite lath boundaries are extensively coarsened. Most of the finer carbides within the matrix are also identified as M_(23)C_6, and no other type of carbide was found except for some tiny plate-like V-rich carbides identified as MC. The V and O mass fractions in the M_(23)C_6 carbides have variable morphologies and locations, which might be due to their coarsening process. They are coarsening at different rates even after long-term exposure at elevated temperature. The formation of V-rich MC during the long-term service contributes to hardness maintenance and is good for microstructural stability.
机译：使用透射电子显微镜（TEM）和色散X射线能谱（EDS）仔细研究了X20CrMoV12.1型马氏体管钢在550℃长期使用后的晶体结构，形态和组成。多数碳化物为M_（23）C_6。原始奥氏体晶粒和马氏体板条边界中的M_（23）C_6粒子被粗化。基质中的大多数较细的碳化物也被标识为M_（23）C_6，除发现一些微小的板状富V的碳化物被标识为MC之外，未发现其他类型的碳化物。 M_（23）C_6碳化物中的V和O质量分数具有可变的形态和位置，这可能是由于其粗化过程所致。即使在高温下长期暴露后，它们也以不同的速率粗化。在长期使用过程中形成富V的MC有助于保持硬度，并有利于微结构的稳定性。

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