Effect of Low-frequency Electromagnetic-field on Macrostructure of Continuous Casting Austenitic Stainless Steel
ZHOU Shu-cai1, LEI Ya1, LI Hua-ji2, REN Zheng-de1, CAO Peng-jun1, YANG Zhi-li1
1. College of Metallurgy and Material Engineering, Chongqing University of Science and Technology, Chongqing, 400050, China; 2. College of Mechanical Engineering, Chongqing University, Chongqing, 400044, China
Abstract：The influence of low-frequency electromagnetic-field on macrostructure of austenite stainless steel in horizontal continuous casting was investigated based on industrial experiment.The results show that application of appropriate electromagnetic stirring parameters can improve the macrostructure of austenitic stainless steel,in which both columnar grains and equiaxed grains are evidently refined and center porosity and shrinkage cavity can be remarkably decreased,and enlarging equiaxed grains zone.The industrial trials verify that the stirring intensity of austenite stainless steel should be higher comparing with plain carbon steel.Electromagnetic stirring has somewhat affected the macrostructure of the austenitic stainless steel even if the the magnetic flux density of the electromagnetic stirring reaches average 90mT(amplitude reaches 141mT)in average at frequencyf=3-4Hz.Due to a higher viscosity,rotating speed of molten stainless steel was 20%-30% lower than that of molten carbon steel in the same magnetic flux density.
周书才, 雷亚, 李华基, 任正德, 曹鹏军, 杨治立. 低频电磁场对奥氏体不锈钢铸坯组织的影响[J]. 材料工程, 2008, 0(11): 32-35,40.
ZHOU Shu-cai, LEI Ya, LI Hua-ji, REN Zheng-de, CAO Peng-jun, YANG Zhi-li. Effect of Low-frequency Electromagnetic-field on Macrostructure of Continuous Casting Austenitic Stainless Steel. Journal of Materials Engineering, 2008, 0(11): 32-35,40.
 HEARD R.Renew of horizontal continuous casting technology[A] Alex McLean Symposium Proceedings[C] USA:Iron and Steel Society/AIME,1998.147-154.  HAISSIG M.Horizontal continuous casting:a technology for the future[J] Iron Steel Eng,1984,61(6):65-71.  TAKEHIKO T,EIICHI T,MASATAKE H,et al.Electromagnetic control of initial solidification in continuous casting of steel by low frequency alternating magnetic field[J] ISIJ International,1997,37(11):1112-1119.  CHO Y W,OH Y J,CHUNG S H,et al.Mechanism of surface quality improvement in continuous cast slab with rectangular cold crucible mold[J] ISIJ International,1998,38 (7):723-729.  KOLESINCHENKO A F,KOLESICHENKO A A,BURYAK V V.Improvement of in mold electromagnetic stirrer by feeding of magnetic system with polyharmonic current[J] ISIJ International,2004,44(2):342-349.  张宏丽,王恩刚,贾光霖,等.电磁搅拌提高铸坯等轴晶比率的数值模拟[J] 东北大学学报,2002,22(5):535-538.  李庆春.铸件形成理论基础[M] 北京:机械工业出版社,1982.  WILLERS B,ECKERT S,MICHEL U,et al.The columnar-to-equiaxed transition in Pb-Sn alloys affected by electromagn-etically driven convection[J] Materials Science and Engineering A,2005,402:55-65.  齐雅丽,贾光林,张国志.电磁搅拌对液态金属运动及凝固组织的影响[J] 铸造技术,2005,26(2):118-120.  钟云波,孟宪俭,倪丹,等.旋转磁场净化钢液的实验研究[J] 上海金属,2006,28(2):9-14.