Advances in the Twin-Roll Strip Casting of Strip with Profiled Cross Section
Advances in the Twin-Roll Strip Casting of Strip with Profiled Cross Section
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异型断面带材双辊连铸研究进展
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
G. Hirt
中科院分区：
文献类型：
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作者：
M. Vidoni;M. Daamen;G. Hirt
薄带直接铸造是一种经济、高效的钢带生产工艺。在一个单一的工艺步骤中，液态钢可以铸造并直接轧制成厚度为1至4毫米的热轧带。通过使用特殊成型的铸辊，可以生产具有优化横截面的带材，允许该工艺与拼焊和拼轧坯料竞争，用于生产已经广泛应用于工业的一类产品。数值和实验研究证明了这一概念的可行性，并使用额外的模拟来优化用于实验的轮廓。可以成功地实现从边缘到中心的一毫米的厚度变化。然而，尺寸精度和粗糙度分布沿着横截面的生产带是不令人满意的。附加的配置文件被应用于实验分析，导致更好的粗糙度分布和几何精度。为了进一步改善沿着型材截面的性能均匀性，必须增加微观结构的均匀性。铸辊的涂层和表面处理在薄带连铸过程中起着非常重要的作用，因为它们强烈地影响凝固行为。这种观察导致选择性地涂覆铸辊的想法，在铸造型材较薄的区域上施加导电性较低的层。因此，可以获得更均匀的凝固前沿。局部改性的铸辊涂层对凝固的影响进行了数值研究，并将结果应用于选择用于实验的涂层参数。
Direct thin strip casting is an economically end energetically smart process for the production of steel strip. In a single process step, liquid steel can be cast and directly rolled to hot strip in thicknesses ranging from one to four millimeters. With the use of specifically profiled casting rolls it is possible to produce strip with optimized cross-sections, allowing this process to compete with tailor welded and tailor rolled blanks for the production of a class of products already widely applied in industry. Numerical and experimental studies proved the feasibility of this concept and additional simulations were used to optimize the profile to be used for the experiments. A thickness variation of one millimeter from the edge to the center could be successfully achieved. However, the dimensional precision and the roughness distribution along the cross section of the produced strip were not satisfactory. Additional profiles were applied for the experimental analysis leading to better roughness distribution and geometrical accuracy. In order to further improve the uniformity of properties along the profiled section it is necessary to increase the homogeneity of the microstructure. The coating and surface preparation of the casting rolls play a very important role in the strip casting process as they strongly affect the solidification behavior. This observation lead to the idea of selectively coating the casting rolls, applying a less conductive layer on the areas where the casted profile is thinner. Thus, a more homogeneous solidification front can be obtained. The effect of a locally modified casting roll coating on the solidification is numerically investigated and the results applied for the selection of the coating parameters to be used for the experiments.