GCr15钢大方坯传热凝固数值模拟
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摘要
以某钢厂GCr15钢大方坯为研究对象,采用ProCAST软件建立凝固数学模型,研究了过热度、拉速和比水量对大方坯凝固过程的影响,并通过对铸坯中心固相率及液芯长度的分析,确定了最佳末端电磁搅拌位置,并优化了拉速。研究结果表明:过热度对铸坯凝固影响最小,随着过热度增加,铸坯表面温度升高,铸坯液芯长度和液相区长度均随之增加,而两相区长度则随之减小;拉速对铸坯凝固影响最大,拉速提高,铸坯表面温度、液芯长度、两相区长度、液相区长度均增大;比水量增加,铸坯表面温度降低,液芯长度减小;当比水量为0.29 L/kg时,过热度应控制在15~35℃,拉速需控制在0.46~0.49m/min,且最佳拉速为0.48 m/min。
The solidification mathematical model was established by using GCr15 steel bloom as a research object.The effects of superheat,casting speedand cooling water on the solidification process of bloom were studied.By analyzing the center solid fraction and liquid core length of the bloom,the optimum F-EMS position was determined and the casting speed was optimized.The results showed that the superheat had the little effect on the solidification of the bloom.With the increase of the superheat,the surface temperature of the billet increased,the length of liquid core and the length of liquid zone increasd,while the length of twophase zone decreased.The effect of casting speed was the largest,the surface temperature,the length of liquid core,the length of two-phase zone and the length of liquid zone were all increased with the increase of the casting speed.With the increase of the water ratio,the surface temperature of the billet and the length of the liquid core decreasd.When the water ratio was 0.29 L/kg,the superheat degree should be controlled at 15-35 ℃,the casting speed could be controlled in the range of 0.46-0.49 m/min,and the best casting speed was 0.48 m/min.
The solidification mathematical model was established by using GCr15 steel bloom as a research object.The effects of superheat,casting speedand cooling water on the solidification process of bloom were studied.By analyzing the center solid fraction and liquid core length of the bloom,the optimum F-EMS position was determined and the casting speed was optimized.The results showed that the superheat had the little effect on the solidification of the bloom.With the increase of the superheat,the surface temperature of the billet increased,the length of liquid core and the length of liquid zone increasd,while the length of twophase zone decreased.The effect of casting speed was the largest,the surface temperature,the length of liquid core,the length of two-phase zone and the length of liquid zone were all increased with the increase of the casting speed.With the increase of the water ratio,the surface temperature of the billet and the length of the liquid core decreasd.When the water ratio was 0.29 L/kg,the superheat degree should be controlled at 15-35 ℃,the casting speed could be controlled in the range of 0.46-0.49 m/min,and the best casting speed was 0.48 m/min.
引文
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[13]王波,陈列,张旭,等.特殊钢连铸大方坯末端电磁搅拌位置研究与应用[J].连铸,2016(5):17-20.
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[15]毛斌,陶金明.方坯连铸凝固末端电磁搅拌(F-EMS)技术[C]//第5期连铸电磁搅拌技术学习研讨班论文集,2008:117-124.
[2]高维,李京社,杨树峰.320 mm×480 mm大方坯凝固过程数值模拟及验证[J].工业加热,2016,45(6):31-34.
[3]宋方圆,孙彦辉,赵勇,等.小方坯末端电磁搅拌位置的确定[J].炼钢,2016,32(3):29-34.
[4]葛亮,曾亚南,汪成义,等.大方坯末端电磁搅拌工艺参数优化[J].炼钢,2015,31(1):61-64.
[5]王建磊,李京社,杨树峰,等.小方坯凝固传热数值模拟及验证[J].连铸,2015(2):43-47.
[6]高向宙,杨树峰,李京社,等.宽厚板坯连铸凝固过程数值模拟[J].铸造技术,2015,36(3):678-683.
[7]LALLY B,BIEGLER L,HENEIN H.Finite difference heattransfer modeling for continuous casting[J].Metallurgical Transactions B,1990,21(4):761-770.
[8]TIEU A K,KIM I S.Simulation of the continuous casting process by a mathematical model[J].International Journal of Mechanical Sciences,1997,39(2):185-192.
[9]盛义平,孔祥东,杨永利.连铸结晶器传热边界条件研究[J].中国机械工程,2007(13):1615-1618.
[10]JING C,WANG X,JIANG M.Study on solidification structure of wheel steel round billet using FE‐CA coupling model[J].Steel Research International,2011,82(10):1173-1179.
[11]王新华.钢铁冶金-炼钢学[M].北京:冶金工业出版社,2007.
[12]沈宏俊,张西超,方忠强,等.45钢大方坯凝固传热数值分析[J].炼钢,2015,31(4):47-53.
[13]王波,陈列,张旭,等.特殊钢连铸大方坯末端电磁搅拌位置研究与应用[J].连铸,2016(5):17-20.
[14]冯军,陈伟庆,王晓峰,等.凝固末端电磁搅拌对高碳钢内部质量的影响[J].钢铁,2006(11):26-28.
[15]毛斌,陶金明.方坯连铸凝固末端电磁搅拌(F-EMS)技术[C]//第5期连铸电磁搅拌技术学习研讨班论文集,2008:117-124.