结晶器内氩气泡分布及钢渣界面波动行为

doi:10.13228/j.boyuan.issn0449-749x.20170526

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Abstract A physical model of the mold with a similarity ratio of 1[∶]0.6 and a mathematical model were built，and the effects of the process parameters on the bubble distribution in mold and the fluctuation at the steel-slag interface were studied by means of the high speed camera and analysis software in water model，and the discrete phase （DPM） model and volume of fluid （VOF） model in mathematical model. The results show that the bubble distribution in the mold calculated by the mathematical model is similar to that measured by the water model simulation. The size of argon bubbles in the mold grows gradually with the increase of argon flow rate，and the distribution of argon bubbles becomes more uniform in the mold. The argon blowing helps to reduce the wave height of the molten steel near the mold narrow face，but it will aggravate the fluctuation near the submerged entry nozzle. With the increase of the casting speed，the size of the argon bubbles in the mold decreases，the distribution in mold becomes more uniform，the wave height near the mold narrow face increases，and the wave height near the submerged entry nozzle decreases observably. The increased port angle and submergence depth of the submerged entry nozzle can help to inhibit the fluctuation of liquid steel near the nozzle and narrow face in mold，and the bubble distribution in the mold becomes relatively uniform，while the size of the argon bubble changes little. When the casting speed is 1.2 m/min，the port angle of submerged entry nozzle is 15°，and the submergence depth of the submerged entry nozzle is 160 mm，the preferable flow rate of argon is 4 L/min. The results can work as the theoretical basis for optimizing the process parameters, preventing the slag entrapment and improving the steel quality.

Received: 01 November 2017 Published: 09 April 2018

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中图分类号：TF777.2

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	CHENG Chang-Gui
	LV Hai-Biao

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CHENG Chang-Gui,LV Hai-Biao. Distribution of argon bubble and fluctuation behavior ofsteel/slag interface in continuous casting mold[J]. Iron and Steel, 2018, 53(4): 27-36.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20170526 OR http://www.chinamet.cn/Jweb_gt/EN/Y2018/V53/I4/27

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