A Numerical Study of the Effect of Multiple Pouring on Macrosegregation in a 438-Ton Steel Ingot  

作　　者：Zhen-Hu Duan Hou-Fa Shen Bai-Cheng Liu 

机构地区：[1]Key Laboratory for Advanced Materials Processing Technology, Ministry of Education [2]School of Materials Science and Engineering, Tsinghua University

出　　处：《Acta Metallurgica Sinica(English Letters)》2015年第9期1123-1133,共11页金属学报（英文版）

基　　金：financially supported by the National Basic Research Program of China (No. 2011CB012900);the National Science and Technology Major Project of the Ministry of Science and Technology of China (No. 2012ZX04012011)

摘　　要：In present paper, a ladle-tundish-mold CFD model and a macrosegregation model were utilized to investigate the effects of the multiple pouring （MP） process on the macrosegregation in a 438-ton steel ingot. Firstly, the model was partially proved as compared to the measured carbon distributions along the transverse sections in the riser of ingot. Then, the comparison between the single pouring （SP） and MP process has been carried out to study their influences on the macrosegregation in ingot. Besides, the predicted macrosegregation results in MP process which introduced the improved riser fixed with an insulating sleeve were compared with that in traditional MP process. The traditional MP process leads to certain favorable initial carbon distribution in the mold, which has some favorable influence on suppressing the positive segregation in ingot. The holding time of the low carbon in the riser is the main factor to suppress the positive segregation in ingot. Improved insulating sleeve can prolong the holding time of the low carbon in the riser and release the positive segregation in the riser of ingot. Improvement of the insulating effect of the riser is an efficient method to control macrosegregation in large steel ingot.In present paper, a ladle-tundish-mold CFD model and a macrosegregation model were utilized to investigate the effects of the multiple pouring （MP） process on the macrosegregation in a 438-ton steel ingot. Firstly, the model was partially proved as compared to the measured carbon distributions along the transverse sections in the riser of ingot. Then, the comparison between the single pouring （SP） and MP process has been carried out to study their influences on the macrosegregation in ingot. Besides, the predicted macrosegregation results in MP process which introduced the improved riser fixed with an insulating sleeve were compared with that in traditional MP process. The traditional MP process leads to certain favorable initial carbon distribution in the mold, which has some favorable influence on suppressing the positive segregation in ingot. The holding time of the low carbon in the riser is the main factor to suppress the positive segregation in ingot. Improved insulating sleeve can prolong the holding time of the low carbon in the riser and release the positive segregation in the riser of ingot. Improvement of the insulating effect of the riser is an efficient method to control macrosegregation in large steel ingot.

关 键 词：Multiple pouring process MACROSEGREGATION Numerical simulation Large steel ingot 

分 类 号：TG26[金属学及工艺—铸造]