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A high-Nb TiAl alloy with highly refined microstructure and excellent mechanical properties fabricated by electromagnetic continuous casting

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China Foundry 2016年第5期13卷 342-345页

作者： Yong-zhe Wang Hong-sheng Ding Rui-run Chen Jing-jie Guo Heng-zhi Fu Jin-peng Lu National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

In the present research, microstructure refinement of a high-Nb TiAl alloy （Ti-48Al-8Nb-0.15B） was realized by means of the electromagnetic continuous casting （EMCC） technique. The microstructure of an ingot obtained by EMCC was analyzed using scanning electron microscopy （SEM）. As compared with the raw as-cast alloy, the obtained EMCC alloy presented a much finer microstructure with lamellar colonies with a mean size of about 50-70 μm because the electromagnetic stirring broke initial dendrites and enhanced the heterogeneous nucleation. As the grains were refined, the properties of the TiAl alloy were improved significantly. This implies that the EMCC technique could offer the possibility of application for high-Nb TiAl alloys with a refined microstructure and excellent properties to be used as a structural material.

关键词： high-Nb TiAl alloy microstructure electromagnetic continuous casting mechanical properties

Numerical Simulation of the electromagnetic continuous casting for Clad Slab

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Journal of Iron and Steel Research International 2012年第S1期19卷 153-157页

作者： YU Ying-shui WANG Tong-min SUN Jian-bo JIE Jin-chuan CAO Zhi-qiang LI Ting-ju School of Materials Science and Engineering Dalian University of Technology School of Materials Science and Engineering Jiamusi University

In this paper,a new electromagnetic continuous casting process to prepare clad slab is *** influence of level direct current electromagnetic field on temperature and flow fields of the melt during the fabrication of clad slab were numerically studied by the engineering software ANSYS and *** results indicated that when the magnetic flux density(B)was 0.15 T,the impact velocity and distance of the flow to the narrow face and underside of the dividing plate decreased *** the flow impact to the liquid pool was *** the same time,the high temperature zone of the melt moved away from the narrow face and the dividing plate,and distributed more uniformly. The wider semi-solid area next to the dividing plate was useful for 3003 and 4004 aluminum alloys to bond.

关键词： clad slab electromagnetic continuous casting numerical simulation

Numerical Simulation of Heat Transfer and Deformation of Initial Shell in Soft Contact continuous casting Mold Under High Frequency electromagnetic Field

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Journal of Iron and Steel Research International 2007年第6期14卷 14-21页

作者： NA Xian-zhao XUE Min ZHANG Xing-zhong GAN Yong State Key Laboratory of Advanced Steel Processes and Materials Central Iron and Steel Research Institute Beijing 100081 China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

Heat transfer and deformation of initial solidification shell in soft contact continuous casting mold under high frequency electromagnetic field were analyzed using numerical simulation method; the relative electromagnetic parameters were obtained from the previous studies. Owing to the induction heating of a high frequency electromagnetic field （20 kHz）, the thickness of initial solidification shell decreases, and the temperature of strand surface and slit copper mold increases when compared with the case without the electromagnetic filed. The viscosity of flux de- creases because of the induction heating of the high frequency electromagnetic field, and the dimension of the flux channel increases with electromagnetic pressure; thus, the deformation behavior of initial solidification shell was different before and after the action of high frequency electromagnetic field. Furthermore, the abatement mechanism of oscillation marks under high frequency electromagnetic field was explained.

关键词： soft contact electromagnetic continuous casting mold heat transfer ~ initial solidification~ elastic-plasticdeformation finite element method numerical simulation