A Numerical Model Of The
Crystallization Of Pure Aluminium
Author(s)
F. Kavicka, J. Stetina, K. Stransky, B. Sekanina, J. Dobrovska
& J. Heger
Abstract
The character of primary crystallization was investigated on a simple cylindrical
sample, crystallizing in a cast-iron mould pre-heated to various temperatures.
The experimental research comprised the measurement of temperatures using
thermocouples, the evaluation of the experimentally acquired temperature
gradients G, and the shift rate of the phase transition interface R. Furthermore, it
comprised the determination of the so-called critical values Gcr and Rcr, which
are reached by the crystallizing metal in the transition interface where the
columnar crystals transform into the equiaxed. The numerical model had been
developed to expand the limited experimental capabilities of the evaluation of G
and R to every point of the longitudinal section, based on the investigation of the
3D transient temperature field within the system comprising the casting, the
mould and ambient. Furthermore, the authors have discovered a new criterion
(called the ‘temperature-delay’ criterion), which predicts the macro-structure.
This criterion cannot only determine the position of the transition interface
between both crystallizations, but also the time in which one transforms into the
other.
Keywords: crystallization, temperature field, numerical model, macro-structure.
1 Introduction
There are successful ways of influencing the crystallization of pure metals and
alloys by inoculation, ultrasonically and using other methods. Influencing the
pouring structure of a temperature field has been managed empirically or semi-
Keywords
crystallization, temperature field, numerical model, macro-structure.
Related Book
Other papers in this volume
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