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Acta Metall Sin  2009, Vol. 45 Issue (11): 1330-1335    DOI:
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EFFECT MECHANISM OF HIGH FREQUENCY ELECTROMAGNETIC FIELD ON THE SURFACE QUALITY AND EQUIAXED CRYSTAL RATIO OF 15CrMo BILLET
XU Xiujie1);    DENG Anyuan1);   WANG Engang1);   ZHANG Lintao1);    ZHANG Yongjie2);   HE Jicheng1)
1) Key Laboratory of Electromagnetic Processing of Materials; Ministry of Education; Northeastern University; Shenyang 110004\par
2) Shanghai Baoshan Iron & Steel Co.; Ltd.; Shanghai 201900
Cite this article: 

XU Xiujie DENG Anyuan WANG Engang ZHANG Lintao ZHANG Yongjie HE Jicheng. EFFECT MECHANISM OF HIGH FREQUENCY ELECTROMAGNETIC FIELD ON THE SURFACE QUALITY AND EQUIAXED CRYSTAL RATIO OF 15CrMo BILLET. Acta Metall Sin, 2009, 45(11): 1330-1335.

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Abstract  

An induced coil surrounding a segmented mold used in soft--contact electromagnetic casting
(soft-contact EMC) was used to produce a high frequency magnetic field for reducing ferrostatic pressure
between the mold and melt. The distribution of magnetic field in the mold was examined using a magnetic
probe of the induction coil type. Then mathematical model was developed to study the distributions of
magnetic field, electromagnetic force and flowing velocity of molten steel in the mold. Finally, continuous casting
experiments were conducted with alloy constructional steel 15CrMo in the laboratory caster. The surface
morphologies and macrostructure were examined and analyzed. Based on the comprehension of the
distributions of magnetic field, electromagnetic force and flowing velocity of molten steel in the mold through
measurements and numerical simulation, the effects  of electromagnetic field were systematically investigated.
The results indicate that when the electromagnetic field was applied in the initially solidified area,
the mold flux consumption was increased dramatically. As a result, the surface quality of continuously
cast billets is greatly improved, for example, oscillation marks disappeared due to the decrease of flux pressure. Moreover, the
growth of columnar grains is suppressed for two main reasons. The first one is that the mold near meniscus is
heated by Joule heat generated by the high frequency electromagnetic field. The other one is that the thermal
resistance between mold and the solidified shell is increased as the increase of mold flux thickness.
Inhomogeneous distributions of magnetic field in the mold along the casting direction were confirmed both by
measurement and numerical simulation. And the Lorentz force on the molten steel along the casting direction is
uneven likewise. Under the drive of Lorentz force, two counter-rotational vortices are formed below the
meniscus. Moreover, the temperature gradient in front of the solid/liquid interface is decreased as a result of the
circulation of liquid steel. Therefore, composition supercooling is easily obtained in the liquid core, which is
helpful to the growth of equiaxed crystals.

Key words:  continuous casting      mold      oscillation mark      mold flux pressure      equiaxed grain      composition supercooling     
Received:  20 April 2009     
ZTFLH: 

TF777

 
Fund: 

Supported by National High Technology Research and Development Program of China (No.2001AA337040), National Natural Science Foundation of China (Nos.50604005 and 50834009)

URL: 

https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2009/V45/I11/1330

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