Conference proceeding
Modeling of porosity formation and feeding flow in steel casting
MODELING OF CASTING, WELDING AND ADVANCED SOLIDIFICATION PROCESSES-X, pp.295-302
2003
Abstract
A multi-phase model is presented that predicts melt pressure, feeding flow, and porosity formation and growth in steel castings during solidification. By combining Darcy's law, which governs fluid flow in the mushy zone, with the equation for Stokes' flow, which governs the motion of slow-flowing pure liquid, it is possible to derive a momentum equation that is valid everywhere in the solution domain. A pressure equation is then derived by combining this momentum equation with a continuity equation that accounts for the solid, liquid and gas phases present. The partial pressures of the gas species dissolved in the melt are determined using the species concentrations, which are found by solving a species conservation equation for each gas species present. This species equation accounts for macrosegregation of gas species due to the flow. Once the total gas pressure is high enough to cause pore nucleation, the amount of porosity that forms is determined from the continuity equation. This multi-phase model has been successfully implemented in a general-purpose casting simulation code. Results are presented to illustrate the basic physical phenomena involved. For two of the examples provided, the predicted porosity distributions are compared to radiographs of steel castings produced in sand molds. Good agreement is found between simulation and casting results.
Details
- Title: Subtitle
- Modeling of porosity formation and feeding flow in steel casting
- Creators
- Kent D CarlsonZhiping LinRichard A HardinChristoph Beckermann - Mechanical EngineeringG MazurkevichM C Schneider
- Contributors
- MJM Krane (Editor)
- Resource Type
- Conference proceeding
- Publication Details
- MODELING OF CASTING, WELDING AND ADVANCED SOLIDIFICATION PROCESSES-X, pp.295-302
- Language
- English
- Date published
- 2003
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984231827602771
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