Abstract

Hypo peritectic steels exhibit a high possibility of longitudinal crack during continuous casting. Therefore, many researchers have studied the mechanisms of crack generation in hypo peritectic steel. Stress in solidified shell, or volume contraction with small liquid fractions were suggested as the mechanisms of crack generation. A new model was developed for predicting possibility of crack generation by calculating strain rates in solid, volume contraction rate during solidification, and the probability of liquid unfilling in continuous cooling processes. The results show that massive transformation from the δ phase to the γ phase, and peritectic transformation during solidification can be the main crack generation mechanisms. Furthermore, a linear relationship exists between the amount of undercooling for peritectic transformation (dT_p) and the carbon content of the boundary for dividing the two crack generation mechanisms. Additionally, the longitudinal crack ratios of the field results are analyzed through strain rates in solid and liquid unfilling possibilities. Relative positions in the range of hypo peritectic steel and effective carbon contents are suggested to analyze the crack ratio of steels with alloying elements. This analysis shows that the results obtained from the new models for crack generation possibility are usable, and dT_p can generate the behavioral differences in crack generation according to the conditions.

Graphical abstract

中文翻译：

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次晶钢连铸裂纹产生行为的数值分析。

摘要

次晶包晶钢在连续铸造过程中极有可能产生纵向裂纹。因此，许多研究人员研究了亚晶包晶钢中裂纹产生的机理。建议将凝固壳中的应力或少量液体部分的体积收缩作为裂纹产生的机理。通过计算固体中的应变率，凝固过程中的体积收缩率以及连续冷却过程中液体不填充的可能性，开发了一种用于预测裂纹产生可能性的新模型。结果表明，从δ相到γ相的大量转变以及凝固过程中的包晶转变是产生裂纹的主要机理。此外，包晶转变的过冷量（dT）之间存在线性关系。_p）和边界的碳含量，以划分两种裂纹产生机理。另外，通过在固体和液体填充可能性中的应变率来分析现场结果的纵向裂缝率。建议用包晶包晶钢范围内的相对位置和有效碳含量来分析含合金元素的钢的裂纹率。该分析表明，从新的裂纹产生可能性模型获得的结果是有用的，并且dT _p可以根据条件在裂纹产生方面产生行为差异。

图形概要