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首页> 外文期刊>Science and Technology of Advanced Materials >Microstructure and texture through thickness of ultralow carbon IF steel sheet severely deformed by accumulative roll-bonding
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Microstructure and texture through thickness of ultralow carbon IF steel sheet severely deformed by accumulative roll-bonding

机译：累积轧制严重变形的超低碳IF钢板的组织和厚度方向的组织

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摘要

Ultralow carbon interstitial free (IF) steel was severely deformed up to a strain of 5.6 by the Accumulative Roll-bonding (ARE) process at 773 K. Crystallographic analysis by electron back-scattering diffraction (EBSD) technique in a field-emission type scanning electron microscope (FE-SEM) was carried out for the ARB processed IF steel throughout thickness of the sheet. Microstructural parameters, such as grain size, grain boundary misorientation and crystal orientation, through thickness of the ARB processed specimen were quantitatively clarified by the EBSD analysis. The ARB processed material was homogeneously filled with the lamellar or pancake-shaped ultrafine grains whose mean grain thickness were about 200-300 nm. More than 80% of the boundaries surrounding the ultrafine grains were high-angle grain boundaries. The ARB processed sheet had unique and complex textural distribution through thickness. The region near the thickness center has the conventional but quite weak rolling texture mainly composed of <110>//RD and <111>//ND. On the other hand, the surface region had the sharp shear texture, ND//<110>. Such a textural distribution is due to the redundant shear strain induced by high-friction between the sheet and roll during rolling. The correspondence between the textural and microstructural distribution and the shear strain distribution throughout thickness of the sheet was discussed.
机译：超低碳无间隙（IF）钢在773 K处通过累积滚动键合（ARE）工艺严重变形至5.6应变。在场发射型扫描中通过电子背散射衍射（EBSD）技术进行晶体学分析在板材的整个厚度上，对ARB处理的IF钢进行电子显微镜（FE-SEM）。通过EBSD分析定量确定了ARB加工试样厚度的微观结构参数，例如晶粒尺寸，晶界失取向和晶体取向。将ARB处理的材料均匀地填充有平均晶粒厚度为约200-300nm的层状或薄煎饼状的超细晶粒。围绕超细晶粒的边界的80％以上是高角度晶粒边界。经过ARB处理的板材在厚度上具有独特而复杂的纹理分布。厚度中心附近的区域具有常规的但相当弱的轧制织构，主要由<110> // RD和<111> // ND组成。另一方面，表面区域具有急剧的剪切织构ND // <110>。这种纹理分布是由于在轧制期间片材和辊之间的高摩擦引起的多余的剪切应变。讨论了整个板材厚度上的组织和微观结构分布与剪切应变分布之间的对应关系。

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