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Effects of forced electromagnetic vibrations during the solidification of aluminum alloys: Part II. solidification in the presence of colinear variable and stationary magnetic fields

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Abstract

The influence on grain refinement of electromagnetic vibrations imposed during solidification of various aluminum alloys has been examined. The vibrations were produced, without any material contact with the solidifying alloys, by the simultaneous application of a stationary magnetic fieldB 0 and a periodic magnetic fieldb(t) of 50 Hz frequency. Extensive grain refinement has been observed in both continuous casting and batch-type mold casting. This investigation shows that the mean grain size obtained by this electromagnetic vibrational method is smaller than that produced by the variable magnetic field acting alone (electromagnetic stirring), particularly when the alloys are characterized by a narrow freezing range.

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Abbreviations

At:

ampere-turn

Bo :

stationary magnetic field

B:

amplitude of the variable magnetic field

B:

rms of the variable magnetic field

b:

variable magnetic field

b0 :

induced magnetic field

g:

gravity

Gr = gβρ2H3ΔT/η2 :

Grashof number

H:

liquid metal height

J:

amplitude of the variable electric current density

J0 :

induced electric current density

j:

variable electric current density induced byb

M = B0H(p/η)1/2 :

Hartmann number

N:

frequency

P′:

electric power input

Re = UHρ/η:

Reynolds number

r:

radial position

u:

local velocity

z:

vertical position

β:

thermal expansion coefficient

δ:

electromagnetic skin depth

ΔT:

superheat

η:

viscosity

ρ:

density

σ:

electric conductivity

ϕ:

phase angle

ω:

angular frequency

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Authors and Affiliations

  1. Faculty of Science, Laboratory of Magnetohydrodynamics, University of Avignon, 84000, Avignon, France

    Charles Vivès (Professor)

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  1. Charles Vivès
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Vivès, C. Effects of forced electromagnetic vibrations during the solidification of aluminum alloys: Part II. solidification in the presence of colinear variable and stationary magnetic fields. Metall Mater Trans B 27, 457–464 (1996). https://doi.org/10.1007/BF02914910

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  • DOI: https://doi.org/10.1007/BF02914910

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