Prediction of columnar to equiaxed transition in alloy castings with convective heat transfer and equiaxed grain transportation

Wajira U. Mirihanage, Shaun McFadden, David J. Browne

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

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.

LanguageEnglish
Title of host publicationShape Casting
Subtitle of host publication3rd International Symposium 2009
Pages257-264
Number of pages8
Publication statusPublished - 1 Oct 2009
EventShape Casting: 3rd International Symposium 2009 - Held During TMS 2009 Annual Meeting and Exhibition - San Francisco, CA, United States
Duration: 15 Feb 200919 Feb 2009

Conference

ConferenceShape Casting: 3rd International Symposium 2009 - Held During TMS 2009 Annual Meeting and Exhibition
CountryUnited States
CitySan Francisco, CA
Period15/02/0919/02/09

Fingerprint

Heat transfer
Nucleation
Silicon alloys
Latent heat
Liquid metals
Solidification
Porous materials
Flow of fluids
Aluminum alloys
Casting
Castings
Liquids

Keywords

  • Cet
  • Equiaxed nucleation
  • Grain transport

Cite this

Mirihanage, W. U., McFadden, S., & Browne, D. J. (2009). Prediction of columnar to equiaxed transition in alloy castings with convective heat transfer and equiaxed grain transportation. In Shape Casting: 3rd International Symposium 2009 (pp. 257-264)
Mirihanage, Wajira U. ; McFadden, Shaun ; Browne, David J. / Prediction of columnar to equiaxed transition in alloy castings with convective heat transfer and equiaxed grain transportation. Shape Casting: 3rd International Symposium 2009. 2009. pp. 257-264
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Mirihanage, WU, McFadden, S & Browne, DJ 2009, Prediction of columnar to equiaxed transition in alloy castings with convective heat transfer and equiaxed grain transportation. in Shape Casting: 3rd International Symposium 2009. pp. 257-264, Shape Casting: 3rd International Symposium 2009 - Held During TMS 2009 Annual Meeting and Exhibition, San Francisco, CA, United States, 15/02/09.

Prediction of columnar to equiaxed transition in alloy castings with convective heat transfer and equiaxed grain transportation. / Mirihanage, Wajira U.; McFadden, Shaun; Browne, David J.

Shape Casting: 3rd International Symposium 2009. 2009. p. 257-264.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - 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.

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Mirihanage WU, McFadden S, Browne DJ. Prediction of columnar to equiaxed transition in alloy castings with convective heat transfer and equiaxed grain transportation. In Shape Casting: 3rd International Symposium 2009. 2009. p. 257-264