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

机译:碳提取复制品中细胞Nb沉淀物的Fe-SEM研究

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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°C 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的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)下使用薄箔或碳萃取复制品进行分析。在这项工作中,现场发射枪扫描电子显微镜(Fe-SEM)在使用碳提取复制品的脱胶(Nb)​​碳氮化物(C,N)沉淀物的表征中成功施用。在400℃下老化之前和1小时之前和之后的高强度线管钢复制品的Fe-SEM观察证实了在铁氧体中沉淀的Nb(C,N)的存在。 Fe-Sem可以分析嵌入钢中的小颗粒(低于50次),但是必须在低电压下进行分析,以最大化空间分辨率,导致信号不佳。然而,可以使用高电压分析Fe-SEM中的碳提取复制品,因为相互作用体积效应不再是问题。

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