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首页> 外文会议>International Conference on Microalloying for New Steel Processes and Applications; 20050907-09; Basque Country(ES) >Characterisation of Niobium Carbide and Carbonitride Evolution within Ferrite: Contribution of Transmission Electron Microscopy and Advanced Associated Techniques
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Characterisation of Niobium Carbide and Carbonitride Evolution within Ferrite: Contribution of Transmission Electron Microscopy and Advanced Associated Techniques

机译：铁素体中碳化铌和碳氮化物演化的表征：透射电子显微镜的贡献和先进的相关技术

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摘要

Niobium is a strong carbide forming element which is often used in microalloyed steels to control the grain size during thermomechanical treatments and to provide strengthening through precipitation processes. A detailed microscopic investigation is one of the keys for understanding the first stages of the precipitation sequence, thus Transmission Electron Microscopy (TEM) is required. The main difficulty of TEM studies is due to the nanometre scale dimensions of the particles, which makes their detection, structural and chemical characterization delicate. Model Fe-(Nb_(0.06%),C_(0.05%)) and Fe-(Nb_(0.05%),C_(0.03%),N_(0.03%)) ferritic alloys subjected to isothermal annealing treatments have been investigated. High Resolution TEM (HRTEM) and conventional TEM (CTEM) were used to characterise the morphology, nature and location of precipitates. Volume fraction measurements and a statistical approach to the determination of precipitate size histograms have been investigated using Energy Filtered TEM (EFTEM) and High Angle Annular Dark Field (HAADF) imaging. Chemical compositions were quantified by Electron Energy Loss Spectroscopy (EELS). The evolution of precipitate composition with time and temperature is compared with previous simulations obtained from new thermodynamic models based on equilibrium boundary conditions.
机译：铌是一种很强的碳化物形成元素，通常用于微合金钢中，以控制热机械处理过程中的晶粒尺寸并通过沉淀过程提供强化作用。进行详细的显微镜研究是了解沉淀序列第一阶段的关键之一，因此需要透射电子显微镜（TEM）。 TEM研究的主要困难是由于颗粒的纳米级尺寸，这使得它们的检测，结构和化学表征变得微妙。研究了经过等温退火处理的模型Fe-（Nb_（0.06％），C_（0.05％））和Fe-（Nb_（0.05％），C_（0.03％），N_（0.03％））铁素体合金。高分辨率TEM（HRTEM）和常规TEM（CTEM）用于表征沉淀物的形态，性质和位置。使用能量过滤TEM（EFTEM）和高角度环形暗场（HAADF）成像技术，已研究了体积分数测量和确定沉淀物大小直方图的统计方法。化学组成通过电子能量损失谱法（EELS）定量。将沉淀物成分随时间和温度的变化与基于平衡边界条件从新的热力学模型获得的先前模拟进行比较。

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