Fluid flow and microstructure formation in a rotating magnetic field during the directional solidification process

Chen, Zhao; Wen, Xiaoli; Chen, Changle

doi:10.1016/j.jallcom.2009.10.194

Cited by 20 publications

(15 citation statements)

References 21 publications

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“…As a consequence, a local temperature increase and tunable flow of the liquid metal can be aroused by the rotating electromagnetic field, with which the nucleus size will be decreased in order to promote heterogeneous crystal growth. As given in Figure , the morphology of the primary tin phase in a hypoeutectic Sn–Bi alloy is found to be modified from coarse dendrite into equiaxed dendrite by implementing a rotation magnetic field during solidification …”

Section: Electromagnetic Field Effectsmentioning

confidence: 99%

“…As given in Figure 2, the morphology of the primary tin phase in a hypoeutectic Sn-Bi alloy is found to be modified from coarse dendrite into equiaxed dendrite by implementing a rotation magnetic field during solidification. [29] By further combining, a rotating magnetic field and the principle of the induction effect, new heating technology of metallic materials has been developed. As shown in Figure 3, a direct current in a coil is applied to induce a static magnetic field with the magnetic line direction perpendicular to the axis of an aluminum billet.…”

Section: Electromagnetic Stirring and Induction Heatingmentioning

confidence: 99%

See 1 more Smart Citation

Electromagnetic Field Assisted Metallic Materials Processing: A Review

Zhao¹,

Chai²,

Zheng³

et al. 2016

steel research int.

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Electromagnetic fields have been widely applied in the field of materials processing, preparation, and analysis. The effectiveness during such processing is, however, highly dependent on the physics of the applied electromagnetic field as well as the electromagnetic responses from the materials. In order to improve the efficiency of electromagnetic field processing, understanding the fundamentals as well as the engineering of the corresponding electromagnetic effects is crucial. Focusing on metallic materials, this research gives a critical overview and discussion on different electromagnetic effects. Subsequently, the electromagnetic responses in different electromagnetic technologies are further discussed. Specifically, the industrial application potential for inclusion removal from liquid metals is evaluated and the energy coefficient is noticed to be substantially improved by increasing the magnetic flux density.

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Section: Electromagnetic Field Effectsmentioning

confidence: 99%

Section: Electromagnetic Stirring and Induction Heatingmentioning

confidence: 99%

Electromagnetic Field Assisted Metallic Materials Processing: A Review

Zhao¹,

Chai²,

Zheng³

et al. 2016

steel research int.

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“…These time-varying magnetic fields mainly include induction coils in furnaces [12], pulsed magnetic fields [13] and rotating or travelling magnetic fields [14,15]. Manifold investigations have declared that an apparent decrease in grain size can be achieved with increasing intensity of forced convection generated by applying the time-varying magnetic fields in the solidifying melt [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Grain Refinement During Directionally Solidifying GCr18Mo Steel at Low Pulling Speeds Under an Axial Static Magnetic Field

Hou

Zhang

Wang

et al. 2017

Acta Metall. Sin. (Engl. Lett.)

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The present work investigates how axial static magnetic field affects the solidification structure and the solute distribution in directionally solidified GCr18Mo steel. Experimental results show that grain refinement and the columnar to equiaxed transition is enhanced with the increases in the magnetic field intensity (B) and temperature gradient (G) and the decrease in the growth speed. This phenomenon is simultaneously accompanied by more uniformly distributed alloying elements. The corresponding numerical simulations verify a thermoelectric (TE) magnetic convection pattern in the mushy zone due to the interaction between the magnetic field and TE current. The TE magnetic convection in the liquid should be responsible for the motion of dendrite fragments. The TE magnetic force acting on the dendrite is one of the driving forces trigging fragmentation.Keywords GCr18Mo steel Á Grain refinement Á Axial static magnetic field Á Columnar to equiaxed transition Á Thermoelectric magnetic force Acta Metallurgica Sinica (English Letters) (2018) 31:681-691 https://doi.org/10.1007/s40195-017-0691-3( 0123456789().,-volV) (0123456789().,-volV)

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“…Electromagnetic fields have been widely used in materials processing for a long time [17][18][19][20][21]. And extensive researches have been carried on to investigate the role of rotating magnetic field (RMF) in non-directional and directional solidification process, such as in the production of copper hollow billets [22,23], superalloy ingots [24][25][26] and Sn-Bi alloy [21].…”

Section: Introductionmentioning

confidence: 99%

“…And extensive researches have been carried on to investigate the role of rotating magnetic field (RMF) in non-directional and directional solidification process, such as in the production of copper hollow billets [22,23], superalloy ingots [24][25][26] and Sn-Bi alloy [21]. It is well known that the liquid metal in the rotating magnetic field is subjected to electromagnetic stirring, and the electromagnetic stirring has the advantages of refining the internal structures of the ingot, increasing the fraction of equiaxed grains and reducing the segregation and shrinkage cavity [21,24,27]. However, the available literature data concerning Al-Ni peritectic alloy in a rotating magnetic field during the nondirectional solidification process are very limited.…”

Section: Introductionmentioning

confidence: 99%