INVESTIGADORES
SCHVEZOV Carlos Enrique
congresos y reuniones científicas
Título:
RELATION BETWEEN AS-CAST MECHANICAL PROPERTIES,
Autor/es:
ARES, ALICIA;; RUBENS CARAM; .; GUEIJMAN; SCHVEZOV, CARLOS.
Lugar:
Thorn Hill Road. Warrendale, PA
Reunión:
Congreso; MCWASP International Conference. Modeling of Casting, Welding and Advanced Solidification Processes XI.; 2006
Institución organizadora:
The Minerals, Metals & Materials Society
Resumen:
The columnar and equiaxed mode of solidification occur when equiaxed grains can nucleate
and grow ahead of the columnar front provoking the columnar to equiaxed transition (CET).
The prediction of the columnar to equiaxed transition is of great interest for the evaluation and
design of the mechanical properties of castings products. Experiments are conducted to analyze
the CET during the upward unsteady state directional solidification of Al-Zn and Zn-Al alloys,
under different conditions of superheat and heat transfer efficiencies at the metal/mould
interface. A combined theoretical and experimental approach is developed to quantitatively
determine the solidification thermal parameters: growth rates, thermal gradients and cooling
rates. The effects of solidification parameters like cooling rate, growth rate and temperature
gradient on the CET position are investigated. Although the metallurgical and micromechanical
aspects of the factors controlling microstructure, microhardness, strength and ductility of alloys
are complex, it is well known that solidification processing variables are of a high order of
importance. The present paper proposes general empirical expressions which permit the
correlation between secondary dendrite spacings, growth rate, local solidification time and
ultimate tensile strength for Zn-Al alloys.