中厚板边部折叠模拟实验及机理研究

发布时间：2019-05-16 00:21

【摘要】：通过对中厚板边部折叠试样的检测分析,对其产生机理和影响因素进行研究.结果显示,中厚板边部折叠现象是板材横轧宽展过程中侧面材料在轧制中受轧辊作用而翻转到板材表面的结果.折叠缺陷处所观察到的微观组织结构,是轧制前板材表面在高温下形成的氧化铁及脱碳层形成的.建立了轧制有限元数值模型,证实折叠缺陷是在轧制过程中由侧面的折叠翻转所造成的.通过实验室实验,得到铸坯边部质量、轧制制度、宽展道次及轧制压下量对中厚板折叠缺陷的影响.实验结果表明横轧宽展导致折叠缺陷的出现,铸坯边部质量对其没有影响,轧制过程中铸坯侧边的折叠经翻平形成表面折叠缺陷,随着横轧展宽的道次及压下量增加,折叠缺陷距边部距离变大.
[Abstract]:Through the detection and analysis of the folding sample at the edge of the medium and heavy plate, the mechanism and influencing factors of the folding sample are studied. The results show that the folding phenomenon of the edge of the medium and heavy plate is the result that the side material is flipped to the surface of the plate by the action of the roll in the process of cross rolling. The microstructure observed at the folding defect is formed by iron oxide and decarbonization layer formed at high temperature on the surface of the sheet before rolling. The finite element numerical model of rolling is established, and it is proved that the folding defect is caused by side folding and flipping in the rolling process. Through laboratory experiments, the effects of billet edge quality, rolling system, wide pass and rolling reduction on folding defects of medium and heavy plate are obtained. The experimental results show that the folding defect is caused by the spread of cross rolling, and the quality of the side of the billet has no effect on it. During the rolling process, the folding of the side of the billet is flattened to form a surface folding defect, with the increase of the pass and the amount of reduction of the broadening of the cross rolling. The distance between the folding defect and the edge becomes larger.
【作者单位】：北京科技大学冶金与生态工程学院;钢铁研究总院连铸技术国家工程研究中心;
【分类号】：TG335.5

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