溶质元素的微观偏析及其对连铸坯中间裂纹的影响

doi:10.13228/j.boyuan.issn1005-4006.20230056

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Abstract Based on the regular hexahedron model proposed by Ueshima et al., and combined with the actual solidification and cooling conditions of continuous casting slab, the microscopic segregation model of solute elements was established. The segregation of solute elements at the crack origin at the end of the columnar crystal region was analyzed by using the segregation model. Considering heat transfer, static pressure of molten steel and phase transformation, the strain of solidified billet shell was simulated by finite element software to analyze the formation mechanism of intermediate crack. The results show that the segregation of phosphorus and sulfur elements at the end of the columnar crystal region is serious, and the segregation of carbon is relatively light. The difference between LIT and ZDT of the crack formation temperature increases significantly due to the segregation of elements. When the thickness of the billet is equal to the distance between the crack origin and the inner arc, that is, 85 mm, the tensile strain of the billet greatly exceeds the critical strain value allowed during the solidification of the billet, which has the external force factor of crack formation.

Key words： solute element microsegregation intermediate crack numerical model strain of solid shell

Received: 28 June 2023

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	LI Maimai
	XIAO Chao
	YAN Hao

Cite this article:

LI Maimai,XIAO Chao,YAN Hao. Microsegregation of solute elements and its effect on intermediate crack of continuous casting slab[J]. CONTINUOUS CASTING, 2023, 42(5): 57-63.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20230056 OR http://www.chinamet.cn/Jweb_lz/EN/Y2023/V42/I5/57

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