Numerical simulation of shrinkage porosity defect in billet continuous casting
Author:
Wang Xingjuan12, Guo Yinxing12, Xiao Pengcheng12, Liu Zengxun12, Zhu Liguang23
Affiliation:
1. College of Metallurgy and Energy, North China University of Science and Technology , Tangshan 063210, Hebei Province , China 2. Collaborative Innovation Center of High Quality Steel Continuous Casting of Hebei Province , Tangshan 063009, Hebei Province , China 3. College of Materials Science and Engineering, Hebei University of Science and Technology , Shijiazhuang 050018, Hebei Province , China
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.
Publisher
Walter de Gruyter GmbH
Subject
Physical and Theoretical Chemistry,Mechanics of Materials,Condensed Matter Physics,General Materials Science
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