电磁搅拌对Q345D连铸坯凝固组织的影响
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摘要
以五矿营口中板有限责任公司(简称五矿营钢)生产的Q345D钢种为研究对象,借助商业软件ProCAST,采用元胞自动机-有限元耦合方法对不同二冷区电磁搅拌强度下,Q345D钢连铸坯凝固组织进行了数值模拟研究。同时,与有无电磁搅拌条件下实际生产的连铸坯组织对比分析,证明模拟结果与试验结果吻合。研究结果表明:当频率为6 Hz,电磁搅拌强度从0 A增加到400 A时,连铸坯内部等轴晶比例逐渐增加,从19.99%增长到了41.39%;晶粒平均半径从1.73×10~(-3)m减小到1.68×10~(-3)m,晶粒平均尺寸从8.21×10~(-6)m~2减少到6.99×10~(-6)m~2,晶粒细化明显。与未施加电磁搅拌相比较,在电磁搅拌的作用下,随着电磁搅拌强度的增加,连铸坯质量有了显著的改善。
Taking the Q345 D steel produced in Minmetals YingKou Medium Plate Co.,Ltd.,as the research object,the effect of strand electromagnetic stirring(SEMS)on solidification structure of Q345 D billets was simulated by the numerical simulation software ProCAST using the cellular automation-finite element(CAFE)model.Simulation results were evaluated by comparison between continuous casting billet with and with out strand electromagnetic stirring(SEMS).It was proved that the simulation results were consistent with experiment results.The results indicate that increasing the electromagnetic stirring intensity can significantly increase the isometric crystal rate,and decrease the average grain size.When the electromagnetic stirring intensity increases from 0 A to 400 A at 6 Hz,the ratio of equiaxed grains increases significantly from 19.99% to 41.39%,the average grain radius decreases from 1.73×10~(-3) m to 1.68×10~(-3) m and the average grain size decreases from 8.21×10~(-6) m~2 to 6.99×10~(-6) m~2.The quality of continuous casting billet has been improved significantly under the effect of electromagnetic stirring.
Taking the Q345 D steel produced in Minmetals YingKou Medium Plate Co.,Ltd.,as the research object,the effect of strand electromagnetic stirring(SEMS)on solidification structure of Q345 D billets was simulated by the numerical simulation software ProCAST using the cellular automation-finite element(CAFE)model.Simulation results were evaluated by comparison between continuous casting billet with and with out strand electromagnetic stirring(SEMS).It was proved that the simulation results were consistent with experiment results.The results indicate that increasing the electromagnetic stirring intensity can significantly increase the isometric crystal rate,and decrease the average grain size.When the electromagnetic stirring intensity increases from 0 A to 400 A at 6 Hz,the ratio of equiaxed grains increases significantly from 19.99% to 41.39%,the average grain radius decreases from 1.73×10~(-3) m to 1.68×10~(-3) m and the average grain size decreases from 8.21×10~(-6) m~2 to 6.99×10~(-6) m~2.The quality of continuous casting billet has been improved significantly under the effect of electromagnetic stirring.
引文
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[2]Poole G M,Heyen M,Nastac L,et al.Numerical modeling of macrosegregation in binary alloys solidifying in the presence of electromagnetic stirring[J].Metallurgical and Materials Transactions:B,2014,45(5):1834.
[3]Yao Q,Luo Z,Li Y,et al.Effect of electromagnetic stirring on the microstructures and mechanical properties of magnesium alloy resistance spot weld[J].Materials and Design,2014,63:200.
[4]Willers B,Barna M,Reiter J,et al.Experimental Investigations of rotary electromagnetic mould stirring in continuous casting using a cold liquid metal model[J].ISIJ International,2017,57(3):468.
[5]李建超,尹永昌,王宝峰.连铸板坯二冷区辊式电磁搅拌器搅拌方式模拟[J].特种铸造及有色合金,2003,33(4):302.
[6]丁贺,张桂芳,杨春雷,等.辊式二冷区电磁搅拌频率对板坯质量影响试验研究[J].连铸,2015(1):17.
[7]KITTAKA S,FUKUOKAYA T,MARUKI Y,et al.Nippon steel strand electro-magnetic stirrer“S-EMS”for slab caster[J].Ratio,2003,10(20):30.
[8]Jing C,Wang X,Jiang M.Study on solidification structure of wheel steel round billet using FEⅣCA coupling model[J].st-eel research international,2011,82(10):1173.
[9]陈光友,倪红卫,张华,等.Al-Si合金凝固组织的数值模拟及预测[J].铸造技术,2009,30(1):48.
[10]白亮.2101双相不锈钢连铸凝固过程组织与热应力研究[D].上海大学,2016.
[11]Gandin Ch A,Rappaz M.A coupled finite element-cellular automaton model for the prediction of dendritic grain structures in solidification processes[J].Acta Metallurgica,1994,42(7):2233.
[12]高向宙,李京社,杨树峰.Q345B宽厚板微观组织优化数值模拟[J].中南大学学报:自然科学版,2015,46(11):3992.
[13]Rappaz M,Gandin Ch A.Probabilistic modelling of microstructure formation in solidification processes[J].Acta Metallurgica et Materialia,1993,41(2):345.
[14]Kurz W,Giovanola B,Trivedi R.Theory of microstructural development during rapid solidification[J].Acta Metall Mater,1986,34(5):823.
[15]蔡开科.连铸坯质量控制[M].北京:冶金工业出版社,2010.
[16]Agrawal S,Ghose A K,Chakrabarty I.Effect of rotary electromagnetic stirring during solidification of In-situ Al-TiB 2 composites[J].Materials and Design,2017(113):195.
[17]Thomas B G,Najjar F M.Finite element modelling of turbulent fluid flow and heat transfer in continuous casting[J].Applied Mathematical Modelling,1991,15(5):226.
[18]Mazumdar D.Mathematical modelling of transport phenomena in continuous casting of steel[J].ISIJ international,1994,34(7):584.
[19]Tadayoshi Takahashi,Masayuki Kudoh,Kiyoshi Ichikawa.Fluidity of the liquid in the solid-liquid coexisting zone[J].Transaction of the Japan Institute of metals,1980(8):531.
[20]王金龙.CAFE模型机理及应用[J].钢铁研究学报,2009,21(10):60.
[21]曹争争,雷步芳,闫红红,等.基于铸辗复合成形工艺的Q235B环坯凝固过程分析[J].热加工工艺,2015,44(1):73.
[22]宋波,翟启杰,毛璟红,等.钢液洁净度对过冷度的影响[J].钢铁,2002,37(10):16.