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首页> 外文期刊>ISIJ international >A TEM Study of Oxide Layers Formed during Decarburization Annealing of Electrical Steel
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A TEM Study of Oxide Layers Formed during Decarburization Annealing of Electrical Steel

机译：电工钢脱碳退火过程中形成的氧化物层的TEM研究

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摘要

It is very important to know the morphology and chemical properties of subscales of oxide layers on surface for controlling and understanding high temperature oxidation in electrical steel. In present work, the oxide layers were investigated by various methods of transmission electron microscopy (TEM) such as scanning transmission electron microscopy (STEM), nanobeam electron diffraction (NBD), energy dispersive X-ray spectrometry (EDS), and electron energy loss spectrometry (EELS). The high-angle annular dark field (HAADF) of STEM could be a useful analysis technique to study the morphology of the oxide layers. The main oxides formed in the subscales during the decarburization annealing were fayalite, iron oxides, and silica, which were identified by EDS, NBD and EELS. The crystalline fayalites were found both in the surface region within several tens nanometers and in the region within a micrometer surrounding silica, and the atomic configuration in the unit cell of the fayalite was presented. Amorphous silica was formed both in the upper region of the subscales with a spherical shape and in the interface between the spherical silica and the iron matrix with a lamellar shape. TEM could be useful technique to characterize morphologies, microstructures and elemental compositions of oxides, and to understand the oxidation mechanism for the manufacture of the high quality electrical steel.
机译：了解表面氧化物层的氧化皮的形貌和化学性质对于控制和理解电工钢的高温氧化非常重要。在当前工作中，通过各种透射电子显微镜（TEM）方法（例如扫描透射电子显微镜（STEM），纳米束电子衍射（NBD），能量色散X射线光谱法（EDS）和电子能量损失）研究了氧化物层光谱仪（EELS）。 STEM的大角度环形暗场（HAADF）可能是研究氧化物层形态的有用分析技术。在脱碳退火过程中，在亚氧化皮中形成的主要氧化物是铁橄榄石，氧化铁和二氧化硅，通过EDS，NBD和EELS进行了鉴定。在数十纳米范围内的表面区域和二氧化硅周围的微米范围内均发现了结晶铁沸石，并给出了铁沸石的晶胞中的原子构型。无定形二氧化硅既形成在球形的子氧化皮的上部区域中，又形成在球形二氧化硅和层状的铁基体之间的界面中。 TEM可能是有用的技术，用于表征氧化物的形态，微观结构和元素组成，并了解用于制造优质电工钢的氧化机理。

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  • 来源
    《ISIJ international》 |2011年第7期|p.1163-1168|共6页
  • 作者

    Sehoon JUNG; Min Serk KWON; Jongho PARK; Seung Bin KIM; Yoon HUH;

  • 作者单位

    Department of Chemistry, Pohang University of Science and Technology, Pohang, 790-784 Republic of Korea Analysis and Assessment Department, Research Institute of Industrial Science and Technology,Pohang, 790-330 Republic of Korea;

    Technical Research Laboratory, POSCO, Pohang, 790-785 Republic of Korea;

    Technical Research Laboratory, POSCO, Pohang, 790-785 Republic of Korea;

    Department of Chemistry, Pohang University of Science and Technology, Pohang, 790-784 Republic of Korea;

    Analysis and Assessment Department, Research Institute of Industrial Science and Technology,Pohang, 790-330 Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    electrical steel; silica; fayalite; decarburization; transmission electron microscopy;

    机译：电工钢二氧化硅铁橄榄石脱碳透射电子显微镜;

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