Melt flow has a very significant influence on the
microstructure formed during solidification. Due to the formation of vortices,
turbulent flow significantly affects the formation of macro-segregation than
laminar flow, for example, in continuous steel casting, where magnetic stirring
is an industrial practice. Several software programs have recently been
developed to simulate solidification processes, where melt flow induced by
magnetic stirring is also considered. However, in practical cases, it is almost
impossible to prove by experiments what the type of melt flow was; at most, it
can be deduced somewhat from the microstructure.
The effect of melt-flow on the microstructure has been
investigated by performing several unidirectional solidification experiments
where the melt has been flown in a rotating magnetic field. It is well-known
that the angular frequency of the melt cylinder always differs from the angular
frequency of the magnetic field. However, it proved to be very difficult to
determine during the experiments. In our present study, the magnetic Taylor
number and the Reynolds number were determined as a function of the radius of
the melt cylinder, the magnetic induction, and the angular frequency of the
magnetic field using the real angular frequency defined by the so-called
pressure -compensation method developed earlier in the case of Ga75In25 alloy.
The simulations developed for performing similar experiments can be checked,
and the different experiments can be compared correctly using the obtained
measurement results. By knowing the critical Reynolds number belonging to the
laminar/turbulent flow transition, the value of critical magnetic induction
belonging to the transition has been determined as a function of the radius of
the melt cylinder. With the described experimental method, it has been possible
to determine at what magnetic induction the flow would be turbulent. The
results can be used to validate the software, and then validated software has a
good chance of characterizing the flow of practical technologies.
Author(s) Details:
Arnold Rónaföldi,
HUN
REN- University of Miskolc, Materials Science Research Group, Hungary and
Institute of Physical Metallurgy, Metal Forming, and Nanotechnology, University
of Miskolc, Hungary.
Zsolt
Veres,
HUN
REN- University of Miskolc, Materials Science Research Group, Hungary and
Institute of Physical Metallurgy, Metal Forming, and Nanotechnology, University
of Miskolc, Hungary.
András Roósz,
HUN REN- University of Miskolc, Materials Science Research Group,
Hungary and Institute of Physical Metallurgy, Metal Forming, and
Nanotechnology, University of Miskolc, Hungary.
Please see the link here: https://stm.bookpi.org/EMMSMFMSA/article/view/13076
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