Abstract
A macroscopic, non-equilibrium model of the Columnar to Equiaxed Transition (CET) in alloy shape casting is presented. Convective heat transfer in the liquid metal and equiaxed grain transportation by fluid flow is included in the model. Nucleation from mould walls is used as the mechanism for columnar grain initiation. Nucleation from inoculants in under-cooled liquid-ahead of the columnar front is considered for equiaxed grain formation. The front tracking model computes the advancement of the columnar front while the average growth of the equiaxed grain envelopes is simultaneously simulated. Latent heat release is incorporated in the model. The columnar mush and the coherent equiaxed dendrites are treated as porous media for convective flow. When equiaxed fraction is sufficient, no further advancement of the columnar front is permitted and the CET position is determined. CET is simulated for solidification of an aluminum-silicon alloy along with predictions of average equiaxed grain sizes.
| Original language | English |
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| Title of host publication | Shape Casting: 3rd International Symposium 2009 |
| Subtitle of host publication | Held during TMS 2009 Annual Meeting & Exhibition, San Francisco, California, USA, February 15-19, 2009 |
| Place of Publication | Warrendale |
| Pages | 257-264 |
| Number of pages | 8 |
| Volume | TMS |
| Publication status | Published - 2009 |
| Event | Shape Casting: 3rd International Symposium 2009 - Held During TMS 2009 Annual Meeting and Exhibition - San Francisco, CA, United States Duration: 15 Feb 2009 → 19 Feb 2009 |
Conference
| Conference | Shape Casting: 3rd International Symposium 2009 - Held During TMS 2009 Annual Meeting and Exhibition |
|---|---|
| Country/Territory | United States |
| City | San Francisco, CA |
| Period | 15/02/09 → 19/02/09 |
Keywords
- Cet
- Equiaxed nucleation
- Grain transport