Numerical simulation of shrinkage porosity defect in billet continuous casting

IF 1.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

High Temperature Materials and Processes Pub Date : 2023-01-01 DOI:10.1515/htmp-2022-0246

Xingjuan Wang, Yi-Chen Guo, Pengcheng Xiao, Zengxun Liu, Liguang Zhu

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Abstract

Abstract Shrinkage porosity is a typical internal defect in the continuous casting billet, which occurs frequently and is difficult to solve. To explore the influence factors of central shrinkage porosity, a novel unsteady thermomechanical coupling analysis algorithm is developed based on the billet solidification characteristics, and the central shrinkage behavior during the ending solidification process is simulated. Results show that when the casting speed increases from 1.6 to 2.8 m·min−1 and the center outward displacement is reduced from 9.20 × 10−2 mm to 5.8 × 10−2 mm, it means casting speed has a significant effect on the formation of shrinkage porosity, and for this caster, the higher casting speed is more suitable for the secondary cooling zone. Without the changes in the solidification structure, when the superheat degree of molten steel increases from 10 to 40°C, the center outward displacement value decreases from 7.12 × 10−2 mm to 6.91 × 10−2 mm. In that case, the superheat degree has no obvious effect on the center displacement value.

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方坯连铸缩孔缺陷的数值模拟

缩孔缩松是连铸坯中常见的内部缺陷，是连铸坯中经常发生且难以解决的缺陷。为探索中心缩孔率的影响因素，基于坯料凝固特性，提出了一种新的非定常热力耦合分析算法，并对终凝固过程中的中心缩孔行为进行了模拟。结果表明:当浇注速度由1.6 m·min - 1增加到2.8 m·min - 1，中心向外位移由9.20 × 10 - 2 mm减小到5.8 × 10 - 2 mm时，说明浇注速度对缩孔率的形成有显著影响，且对于该连铸机，较高的浇注速度更适合于二冷区;在不改变凝固组织的情况下，当钢液过热度从10℃增加到40℃时，中心向外位移值从7.12 × 10−2 mm减小到6.91 × 10−2 mm。在这种情况下，过热度对中心位移值没有明显影响。

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来源期刊

High Temperature Materials and Processes 工程技术-材料科学：综合

CiteScore

2.50

自引率

0.00%

发文量

审稿时长

3.9 months

期刊介绍： High Temperature Materials and Processes offers an international publication forum for new ideas, insights and results related to high-temperature materials and processes in science and technology. The journal publishes original research papers and short communications addressing topics at the forefront of high-temperature materials research including processing of various materials at high temperatures. Occasionally, reviews of a specific topic are included. The journal also publishes special issues featuring ongoing research programs as well as symposia of high-temperature materials and processes, and other related research activities. Emphasis is placed on the multi-disciplinary nature of high-temperature materials and processes for various materials in a variety of states. Such a nature of the journal will help readers who wish to become acquainted with related subjects by obtaining information of various aspects of high-temperature materials research. The increasing spread of information on these subjects will also help to shed light on relevant topics of high-temperature materials and processes outside of readers’ own core specialties.