Přístupnostní navigace
E-application
Search Search Close
Publication detail
KAVIČKA, F. STRÁNSKÝ, K. SEKANINA, B. ŠTĚTINA, J.
Original Title
A Numerical Model of the Crystallization of Pure Aluminium
Type
conference paper
Language
English
Original 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 can not 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
Authors
KAVIČKA, F.; STRÁNSKÝ, K.; SEKANINA, B.; ŠTĚTINA, J.
RIV year
2006
Released
1. 5. 2006
Publisher
Tanger Ostrava,
Location
Tanger Ostrava, Keltičkova 62, 710 00 Ostrava
ISBN
80-86840-18-2
Book
Metal 2006
Edition
15
Edition number
1
Pages from
Pages to
8
Pages count
BibTex
@inproceedings{BUT18920, author="František {Kavička} and Karel {Stránský} and Bohumil {Sekanina} and Josef {Štětina}", title="A Numerical Model of the Crystallization of Pure Aluminium", booktitle="Metal 2006", year="2006", series="15", number="1", pages="1--8", publisher="Tanger Ostrava,", address="Tanger Ostrava, Keltičkova 62, 710 00 Ostrava ", isbn="80-86840-18-2" }