Simulation of the macrosegregation in the gear steel billet continuous casting process

WANG Ya-dong; ZHANG Li-feng; ZHANG Hai-jie

doi:10.13374/j.issn2095-9389.2020.02.27.001

Volume 43 Issue 4

Mar. 2021

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WANG Ya-dong, ZHANG Li-feng, ZHANG Hai-jie. Simulation of the macrosegregation in the gear steel billet continuous casting process[J]. Chinese Journal of Engineering, 2021, 43(4): 561-568. doi: 10.13374/j.issn2095-9389.2020.02.27.001

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WANG Ya-dong, ZHANG Li-feng, ZHANG Hai-jie. Simulation of the macrosegregation in the gear steel billet continuous casting process[J]. Chinese Journal of Engineering, 2021, 43(4): 561-568. doi: 10.13374/j.issn2095-9389.2020.02.27.001

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Simulation of the macrosegregation in the gear steel billet continuous casting process

doi: 10.13374/j.issn2095-9389.2020.02.27.001

1.
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
State Key Lab of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China

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Corresponding author: E-mail: zhanglifeng@ysu.edu.cn
Received Date: 2020-02-27
Publish Date: 2021-04-26

Abstract

Abstract

Macrosegregation forms due to relative motion between liquid and solid phases on the macro scale during solidification. As macrosegregation is formed during a solidification process, it is difficult to remove it in the subsequent rolling and heat treatment processes, thereby deteriorating the mechanical properties and stability of products. Studies of macrosegregation of billets for industrial trials have become a challenge due to the high temperature of the casting process. To improve macrosegregation of billet, a moving slice model was developed using the ProCAST software based on a continuous casting process of gear steel billet in a domestic steel mill. During the continuous casting process, macrosegregation can be calculated using the above model. The effects of superheat, secondary cooling water flows, and casting speed on macrosegregation were simulated. These results were consistent with the measured outcomes of carbon macrosegregation, validating the moving slice model to calculate the macrosegregation of billet. The solute concentration on the loose side is higher than that on the fixed side due to solute buoyancy. The degree of carbon segregation in the billet center increases from 1.06 to 1.15, with an increase in superheat, which should be controlled below 25 ℃ to ensure the degree of carbon segregation within 1.10. However, the degree of carbon segregation in the billet center decreases from 1.16 to 1.13, with an increase of secondary cooling water flow and a little improvement in central segregation. With an increase in casting speed, the central segregation becomes serious, and the degree of carbon segregation in the billet center increases from 1.14 to 1.21. However, when the casting speed is lower than 1.4 m·min^?1, the degree of carbon segregation in the billet center comes lower than 1.15.
- macrosegregation,
- superheat,
- secondary cooling water flow,
- casting speed,
- gear steel

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References(27)

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