凝固末端螺旋电磁搅拌对大圆坯裂纹形成的影响

doi:10.13228/j.boyuan.issn1006-9356.20230351

Abstract
Figure/Table
References
Related Citation (9)

Download: PDF (0 KB) HTML (0 KB)
Export: BibTeX | EndNote (RIS)

Abstract Internal crack is one of the common defects for special steel bloom. Electromagnetic stirring is the common technical means to improve the uniformity of microstructure and composition of the bloom. The helical electromagnetic stirrer is not only simple in structure, convenient in installation, but also has obvious stirring effect. To investigate the effect of final helical electromagnetic stirring (F-HEMS) on the liquid steel flow, heat transfer and crack formation in large bloom, experiments and numerical simulations were carried out. It is found that the liquid steel in the liquid core is spirally flowing along the casting direction under the action of electromagnetic force, and the range is concentrated in the height range of the electromagnetic stirrer. The temperature gradient between zero ductility temperature and liquid impenetrable temperature (TZD-TLI) in continuous casting bloom is increased by 31.56%-42.27% and the TZD-TLI zone width is decreased by 6.6 mm with F-HEMS. Under the influence of F-HEMS, the liquid fraction in the mushy zone decreases. The distributions of temperature, Von-Mises stress and elastic equivalent strain in continuous casting bloom are all stratified. After the application of F-HEMS, Von-Mises stress and elastic equivalent strain in TZD-TLI zone of continuous casting bloom decrease by 0.11 MPa on average and 0.02 percent point on average, respectively. Based on numerical simulations and experiments, a cracking index formula is proposed to predict the internal cracking risk. It is found that the crack index when using F-HEMS is 0.158-0.280 smaller than when not using F-HEMS, which proves that F-HEMS can reduce the probability of crack formation in continuous casting bloom. However, the formation of internal cracks is affected by many factors, and the cracking prediction of large bloom in continuous casting process still needs to improve the simulation method and be proved by a large number of experimental data. F-HEMS affects liquid steel flow and heat transfer in continuous casting large bloom, reduces the probability of internal crack formation. The research results provide a theoretical basis for industrial production.

Key words： continuous casting large bloom final helical electromagnetic stirring liquid steel flow solidification and heat transfer crack formation

Received: 31 May 2023

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	WU Hongjian
	XU Changjun
	LEI Chong
	WANG Tao
	LIN Huijie
	LI Jing

Cite this article:

WU Hongjian,XU Changjun,LEI Chong等. Effect of final helical electromagnetic stirring on crack formation in large bloom[J]. China Metallurgy, 2023, 33(11): 72-80.

URL:

http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20230351 OR http://www.zgyj.ac.cn/EN/Y2023/V33/I11/72

[1]	马敏,冯俊小,董杰,等. 国内大规格圆坯加热工艺现状分析与对策[J]. 冶金能源,2017,36(5):13.
[2]	WIMMER F G,THÖNE H, PENNERSTORFER P. New vertical bloom caster[J]. Metallurgical Research and Technology,2014,112(1):101.
[3]	ZHANG L W, WANG Z L, XU C J,et al. A vertical continuous casting machine for large blooms[J]. Ironmaking and Steelmaking,2017,46(8):742.
[4]	周开明,董娟. 弧形连铸机生产S355 NL/Q355 NE钢ø1 200 mm连铸圆坯的工艺实践[J]. 特殊钢,2023,44(1):10.
[5]	张志霄,韩蕾蕾,李向龙,等. 旋流水口对大圆坯结晶器内流动及夹杂物去除行为影响[J]. 连铸,2023(4):48.
[6]	韩蕾蕾,邹春锋. 大圆坯环形锻件探伤缺陷类型及机理论述[J]. 连铸,2022(5):114.
[7]	赵志刚,仇圣桃,朱荣,等. 连铸工艺参数对42CrMo大圆坯碳偏析的影响[J]. 热加工工艺,2016,45(9):74.
[8]	牛亮,仇圣桃,赵俊学,等. 连铸工艺参数对38CrMoAl大圆坯碳偏析的影响[J]. 钢铁研究学报,2018,30(5):359.
[9]	赵志刚,张锦文,王育田,等. 连铸工艺参数对ø390 mm GCr15大圆坯碳偏析的影响[J]. 热加工工艺,2023,52(15):68.
[10]	范斌,刘利,张思远,等. 齿轮钢20CrMnTiH连铸大圆坯宏观偏析控制[J]. 连铸,2023(4):23.
[11]	ENGSTROM G,FREDRIKSSON H,ROGBERG B. On the mechanism of macrosegregation formation in continuous cast steels[J]. Scandinavian Journal of Metallurgy,1983,12(1):3.
[12]	SIVESSON P,HÃILEN G,WIDELL B. Improvement of inner quality of continuously cast billets using electromagnetic stirring and thermal soft reduction[J]. Ironmaking and Steelmaking,1998,25(3):239.
[13]	姜盛鑫,林立民. 改善大圆坯中心裂纹缺陷的工艺优化研究[J]. 特钢技术,2022,28(2):22.
[14]	谢仲豪,何杨,刘建华,等. 大断面连铸圆坯中心裂纹的成因和控制研究[J]. 炼钢,2021,37(3):51.
[15]	LI G L,JI C,ZHU M Y. Prediction of internal crack initiation in continuously cast blooms[J]. Metallurgical and Materials Transactions B,2021,52B(2):1164.
[16]	LI X B,DING H,TANG Z Y,et al. Formation of internal cracks during soft reduction in rectangular bloom continuous casting[J]. International Journal of Minerals,Metallurgy and Material,2012,19(1):21.
[17]	任忠鸣,雷作胜,李传军,等. 电磁冶金技术研究新进展[J]. 金属学报,2020,56(4):583.
[18]	毛斌,张桂芳,李爱武. 连续铸钢用电磁搅拌的理论与技术[M]. 北京:冶金工业出版社,2012.
[19]	肖红,王璞,郑晴,等. 辊式电磁搅拌线圈位置对板坯凝固行为的影响[J]. 钢铁,2023,58(3):79.
[20]	郭庆涛,唐雪峰,李泽林,等. 单绕组螺旋电磁搅拌对高碳大方坯中心偏析影响的研究[J]. 材料导报,2022,36(8):153.
[21]	GUO Q T,JIA J X,LIAO X W,et al. Research of helical magnetic field stirring in bloom continuous casting[C]//The 6th International Steelmaking Technology Conference. Beijing:The Chinese Society for Metals,2015:666.
[22]	WU H J,XU C J,JIN H Y,et al. Effect of different positions of final electromagnetic stirring for ø800 mm vertical round billet on fluid flow and heat transfer[J]. Applied Physics A,2022,128(2):1.
[23]	WU H J,XU C J,LEI C,et al. Numerical simulation and industrial experiment of the fluid flow and heat transfer in large vertical round billets with helical final electromagnetic stirring[J]. JOM,2022,75(5):1439.
[24]	REN B Z,CHEN D F,XIA W T,et al. Numerical simulation of electromagnetic field in round bloom continuous casting with final electromagnetic stirring[J]. Metals,2018,8(11):903.
[25]	BARNA M,JAVUREK M,REITER J,et al. Numerical simulations of mould electromagnetic stirring for round bloom strands[J]. BHM Berg und Huettenmannische Monatshefte,2009,154(11):518.
[26]	TRINDADE L B,VILELA A C F,FILHO Á F F,et al. Numerical model of electromagnetic stirring for continuous casting billets[J]. IEEE Transactions on Magnetics,2011,38(6):3658.
[27]	YAGHI A H,HYDE T H,BECKER A A,et al. Residual stress simulation in welded sections of P91 pipes[J]. Journal of Materials Processing Technology,2005,167(2/3):480.
[28]	张鹏程,黄磊,赵东山,等. 钢液密度法计算铸钢浇注重量[J]. 热加工工艺,2004,33(9):60.
[29]	WON Y M,YEO T J,SEOL D J,et al. A new criterion for internal crack formation in continuously cast steels[J]. Metallurgical and Materials Transactions B,2000,31(4):779.
[30]	FARUP I,DREZET J M,RAPPAZ M. In situ observation of hot tearing formation in succinonitrile-acetone[J]. Acta Materialia,2001,49(7):1261.
[31]	PHILLION A B,HAMILTON R W,FULORIA D,et al. In situ X-ray observation of semi-solid deformation and failure in Al-Cu alloys[J]. Acta Materialia,2011,59(4):1436.
[32]	陈美成,赵宇,郭庆涛,等.42CrMo钢圆坯芯部热裂形成条件热模拟[J]. 中国冶金,2023,33(6):65.
[33]	CLYNE T,WOLF M,KURZ W. The effect of melt composition on solidification cracking of steel with particular reference to continuous casting[J]. Metallurgical and Materials Transactions B,1982,13(2):259.
[34]	WON Y,KIM K,YEO T,et al. Effect of cooling rate on ZST,LIT and ZDT of carbon steels near melting point[J]. ISIJ International,1998,38(10):1093.
[35]	BRIMACOMBE J K,SORIMACHI K. Crack formation in the continuous casting of steel[J]. Metallurgical Transactions B,1977,8(2):489.
[36]	YIN H B,YAO M. Analysis of the nonuniform slag film,mold friction,and the new cracking criterion for round billet continuous casting[J]. Metallurgical Materials Transactions B,2005,36(6):857.
[37]	POLTARAK G,FERRO S,CICUTTI C. Estimation of internal cracking risk in the continuous casting of round bars[J]. Steel Research International,2016,88(4):1.