Combined experimental and numerical investigation of the formation of macrosegregation during multicomponent steel solidification
- RWTH Aachen (Germany). Giesserei-Institut
- Univ. of Iowa, Iowa City, IA (United States). Dept. of Mechanical Engineering
The formation of macrosegregation during the solidification of a multicomponent steel (0.42 wt.% C) in a rectangular furan mold with a riser is investigated experimentally and simulated numerically. The observed casting microstructure consists mostly of columnar dendrites, with an equiaxed zone at the bottom center. Spectral analysis shows negative macrosegregation along the walls of the casting and in the equiaxed zone, and positive macrosegregation at the top center of the casting into the riser. In the numerical simulations, conservation of ten elements is considered simultaneously with heat, mass and momentum conservation in two-dimensions. Stationary solid phases are assumed, and thermosolutal convection and the peritectic transformation are accounted for. Predictions show the formation of channels in the mushy zone, and similar macrosegregation patterns for the all of the elements (although their severity of segregation differs). The measured and predicted macrosegregation patterns are similar, although there are large differences where the equiaxed zone exists in the actual casting.
- OSTI ID:
- 227789
- Report Number(s):
- CONF-9509118--; ISBN 0-87339-297-3
- Country of Publication:
- United States
- Language:
- English
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99 GENERAL AND MISCELLANEOUS
BOUNDARY CONDITIONS
CHEMICAL COMPOSITION
CORRELATIONS
DENDRITES
DIFFERENTIAL EQUATIONS
FINITE DIFFERENCE METHOD
INTERFACES
MATHEMATICAL MODELS
MICROSTRUCTURE
PHYSICAL PROPERTIES
SIMULATION
SOLIDIFICATION
STEELS
TEMPERATURE GRADIENTS
THREE-DIMENSIONAL CALCULATIONS
TWO-DIMENSIONAL CALCULATIONS
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