During the last two decades, many algorithms have been
developed to simulate solidification processing for different casting methods,
such as the continuous casting of steel and the direct chill cast of aluminium.
Experiments performed in well-known conditions and the detailed knowledge of
meso- and microstructures are necessary to validate these simulations. The
primary aim of this chapter is to examine the effect of melt flow on the meso-
and microstructure of the Al-7wt% Si binary alloy. When developing simulations
describing solidification, it is complicated to consider melt flow and its
effect on the emerging meso and microstructure. Several experiments are in the
literature in which melt probably flowed during solidification. Still, the
exact parameters of the experiment and the meso and microstructure formed
during solidification are unknown. In this chapter, we present a well - defined
experiment and its results, which can be used to validate a simulation that
also considers melt flow.
Unidirectional solidification experiments were performed
using a rotating magnetic field (RMF) to study the effect of melt flow on the
solidified meso- and microstructure of the Al-7wt% Si binary alloy. The
samples' first and third 1/3 parts were solidified without magnetic stirring,
and the second (middle) 1/3 part was solidified using magnetic stirring. The
magnetic induction was 10 mT, the temperature gradient was ~7 K/mm, and the
sample movement velocity was 0.1 mm/s. On the longitudinal section of the Sample,
the columnar/equiaxed transition (CET), the equiaxed/columnar transition (ECT),
the secondary dendrite arm spacing (SDAS), and the macrosegregation
(concentration distribution and the amount of eutectic) were investigated. The
primary dendrite arm spacing (PDAS) and the grain structure were studied on the
cross-section after colour etching. Finally, it is concluded that progressive
columnar/equiaxed transition (CET) caused by the magnetic stirring developed
between the non-stirred and the stirred part of the sample.
Author(s) Details:
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.
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.
Anna Sycheva,
HUN REN- University of Miskolc, Materials Science Research Group,
Hungary.
Mária Svéda,
HUN REN- University of Miskolc, Materials Science Research Group,
Hungary.
Please see the link here: https://stm.bookpi.org/EMMSMFMSA/article/view/13080
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