Abstract

The metallographic methods of studying the structural features of the metal of a continuously cast slab and the hot-deformed metal with a carbon content of up to 0.31% produced on the casting and rolling complex at the Vyksa Steel Works are considered. The main attention is paid to methodological solutions, which allow us to qualitatively and quantitatively estimate the dendritic structure and the initial austenite grain size in a continuously cast slab and to find a relation between the structural states of continuously cast steel and the related hot-rolled steel. Such quantitative indicators of the dendritic structure of a “thin” continuously cast slab as the density of a dendritic structure and the secondary dendrite arm spacing are determined. The secondary dendrite arm spacings in a thin slab are found to be several times smaller than that in a “thick” slab. The change in a dendritic structure induced by hot deformation is shown to be best estimated using the change in the sizes and number of dendritic structure elements.

中文翻译：

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连铸板坯和铸轧联合生产的热轧金属组织状态的研究方法

摘要

考虑了研究连铸板坯金属的结构特征的金相方法，以及在 Vyksa 钢厂的铸轧联合体中生产的碳含量高达 0.31% 的热变形金属。主要关注方法解决方案，它使我们能够定性和定量地估计连铸板坯中的枝晶组织和初始奥氏体晶粒尺寸，并找到连铸钢的组织状态与相关热轧钢之间的关系钢。确定“薄”连铸板坯的枝晶组织密度和二次枝晶臂间距等定量指标。发现薄板中的二次枝晶臂间距比“厚”板中的小几倍。由热变形引起的树枝状结构的变化显示出最好使用树枝状结构元素的尺寸和数量的变化来估计。