Precipitation Behavior and Its Effect on Surface Transverse Cracks During Continuous Casting

Peng Lan, Yi-fan Lu, Ying-chun Wang, Li-rui Zhang,Jia-quan Zhang

Journal of Iron and Steel Research International（2025）SCI 3区

School of Metallurgical and Ecological Engineering

Cited 0|Views3

Abstract

Precipitation of carbides, nitrides, and carbonitrides is an important factor influencing the formation of surface transverse cracks in the continuous casting of microalloyed steel, affecting the quality and yield of the final product. Based on previous investigation, the precipitation sequence and temperature, position and mode, as well as the size, morphology, and number of different types of precipitates were reviewed. The effects of C, N, Nb, Ti, and V on the precipitation behavior and surface transverse cracks in continuous casting slabs were summarized, with a particular emphasis on the new achievements concerning Ti addition. The critical amounts of different elements to avoid serious surface cracks during continuous casting were proposed. The control mechanisms and industrial effects of composition optimization, cooling design, and chamfered mold configuration to improve surface transverse cracks in continuous casting slabs were also illustrated, and the recent application of surface microstructure control technology was emphasized. The characteristics, advantages, and shortcomings of existing theoretical and experimental methods in investigating continuous casting surface cracks regarding precipitation are finally discussed, and a new setup with advanced functions is introduced.

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Key words

Microalloyed steel,Surface transverse crack,Precipitation,Hot ductility,Continuous casting

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【要点】：本文综合研究了微合金钢连续铸造过程中碳化物、氮化物和碳氮化物的析出行为及其对表面横向裂纹的影响，提出了元素临界含量和控制机制，并引入了一种新的实验装置。

【方法】：文章回顾了析出序列、温度、位置和模式以及不同类型析出物的尺寸、形态和数量的研究，并总结了对C、N、Nb、Ti和V元素影响的研究成果。

【实验】：通过实验研究了不同元素在连续铸造过程中析出行为及其对表面横向裂纹的影响，使用的数据集包括微合金钢的成分和铸造条件，实验结果表明了元素优化、冷却设计和对角模配置对改善表面横向裂纹的有效性。