连铸工艺参数对高碳钢小方坯凝固组织的影响
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摘要
通过CAFE模型,对SWRH82B钢小方坯的凝固组织进行数值模拟,研究了中间包钢水过热度、连铸坯拉速、二冷比水量对铸坯凝固组织的影响规律。结果表明,钢液过热度从5℃增加到45℃,铸坯的等轴晶率从39.7%不断减小到23.1%,晶粒尺寸变大;过热度为25~35℃时,等轴晶率和晶粒尺寸变化小。二冷比水量从0.5 L/kg增加到0.8 L/kg时,铸坯等轴晶率逐渐从34.4%减小到29.2%,但是晶粒尺寸不断变大。比水量达到0.8 L/kg后,继续增加将不再减小铸坯等轴晶率,但是会细化晶粒。拉速从1.25 m/min提高到2.25 m/min,铸坯等轴晶率由29.1%不断增大到38.3%,晶粒也随之不断细化。
Through the CAFE model,the numerical simulation of the solidification structure of SWRH82 B steel billets were studied,and the influence of the water overheat in the tundish,the casting speed and the water ratio on the secondary cooling solidifying structure of the casting billets were studied.The results show that the molten steel superheat increase from 5 ℃ to 45 ℃,equiaxial crystal ratio of billet and decreases from 39.7% to 23.1%,and the grain size is increasing;superheating temperature is 25~35 ℃,the equiaxial crystal and the grain size reduce.When the cooling water ratio increase from 0.5 L/kg to 0.8 L/kg,the axial crystal ratio of billets is gradually decreased from 34.4% to 29.2%,but the grain size continues to increase.The axial crystal ratio of casting billets will no longer reduce with continuous increasing the water volume up to 0.8 L/kg,but the grain size will be refined.The casting drawing speed is raised from 1.25 m/min to 2.25 m/min,and the axial crystal rate of casting billets is increased from 29.1% to 38.3%,and the grain size will be refined.
Through the CAFE model,the numerical simulation of the solidification structure of SWRH82 B steel billets were studied,and the influence of the water overheat in the tundish,the casting speed and the water ratio on the secondary cooling solidifying structure of the casting billets were studied.The results show that the molten steel superheat increase from 5 ℃ to 45 ℃,equiaxial crystal ratio of billet and decreases from 39.7% to 23.1%,and the grain size is increasing;superheating temperature is 25~35 ℃,the equiaxial crystal and the grain size reduce.When the cooling water ratio increase from 0.5 L/kg to 0.8 L/kg,the axial crystal ratio of billets is gradually decreased from 34.4% to 29.2%,but the grain size continues to increase.The axial crystal ratio of casting billets will no longer reduce with continuous increasing the water volume up to 0.8 L/kg,but the grain size will be refined.The casting drawing speed is raised from 1.25 m/min to 2.25 m/min,and the axial crystal rate of casting billets is increased from 29.1% to 38.3%,and the grain size will be refined.
引文
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[2]Ludlow V,Normanton A,Anderson A,et al.Strategy to minimise central segregation in high carbon steel grades during billet casting[J].Ironmaking&Steelmaking,2013,32(1):68-74.
[3]马长文,沈厚发,黄天佑,等.等轴晶移动对宏观偏析影响的数值模拟[J].材料研究学报,2004,18(3):232-238.
[4]杨恩娜,张雅静,赵文娟,等.金属凝固微观组织的相场模拟研究进展[J].铸造技术,2010,31(11):1510-1513.
[5]赵莉萍,李钊,袁雪,等.成分对CAFE法凝固组织模拟计算的影响[J].铸造技术,2015,36(2):407-411.
[6]Juric D,Tryggvason G.A front-tracking method for dendritic so-lidification[J].J Comput Phys,1996,123(1):127-148.
[7]Caginalp G,Fife P.Phase field methods for interfacial bounda-ries[J].Phys Rev B,1986,33(11):7792-7794.
[8]Ignaszak Z,Hajkowski M,Hajkowski J.Prediction of dendritic microstructure using the cellular automaton-finite element method for hypoeutectic Al-Si alloys castings[J].Materials Science,2006,12(2):124-128.
[9]Thévoz P,Desbiolles J L,Rappaz M.Modeling of equiaxed microstructure formation in casting[J].Metallurgical and Materials Transactions A,1989,20(2):311-322.
[10]宋迎德,郝海,谷松伟,等.枝晶尖端生长速度对凝固组织数值模拟的影响研究-Ivantsov函数近似方式的确定[J].铸造技术,2011,32(1):34-38.
[11]Kurz W,Fisher D J.Fundamentals of Solidification[M]//Fundamentals of solidification.Trans Tech Publications,1989:71-92.
[12]Gandin C A,Desbiolles J L,Rappaz M,et al.A three-dimensional cellular automation-finite element model for the prediction of solidification grain structures[J].Metallurgical and Materials Transactions A,1999,30(12):3153-3165.
[13]Yamazaki M,Natsume Y,Harada H,et al.Numerical simulation of solidification structure formation during continuous casting in Fe-0.7mass%C alloy using cellular automaton method[J].ISIJ International,2006,46(6):903-908.
[14]虞觉奇.二元合金状态图[M].上海:上海科学技术出版社,1987.
[15]陈家祥.钢铁冶金学[M].北京:冶金工业出版社,2004.