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FE-SEM Study of Fine Nb Precipitates in Carbon Extraction Replicas

机译:碳萃取复制物中细微Nb沉淀的FE-SEM研究

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摘要

Precipitation strengthening is an important parameter controlling the mechanical properties of low carbon steels. These precipitates are very fine and are normally analyzed using either thin foils or carbon extraction replicas under a transmission electron microscopy (TEM). In this work, field emission gun scanning electron microscope (FE-SEM) was applied successfully in the characterization of niobium (Nb) carbo-nitride (C,N) precipitates using carbon extraction replicas. FE-SEM observation of high strength linepipe steel replicas before and after aging at 400℃ for 1 hr confirmed the presence of Nb(C,N) precipitates in ferrite. The FE-SEM could analyze small particles (below 50 ran) embedded in the steel but the analysis had to be carried out at low voltages to maximize spatial resolution resulting in a poor signal. However, carbon extraction replicas in the FE-SEM can be analyzed using high voltages, since the interaction volume effect is no longer a problem.
机译:沉淀强化是控制低碳钢机械性能的重要参数。这些沉淀物非常细,通常在透射电子显微镜(TEM)下使用薄箔或碳提取物进行分析。在这项工作中,场发射枪扫描电子显微镜(FE-SEM)被成功地用于使用碳提取复制品表征铌(Nb)碳氮化物(C,N)沉淀物。对高强度管线钢复制品进行400℃时效1小时前后的FE-SEM观察证实,铁素体中存在Nb(C,N)析出物。 FE-SEM可以分析嵌入钢中的小颗粒(50纳米以下),但必须在低电压下进行分析以最大化空间分辨率,从而导致信号差。但是,由于相互作用体积效应不再是问题,因此可以使用高电压分析FE-SEM中的碳提取副本。

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