Modeling of combined melt convection and solid transport during equiaxed dendritic solidification

Chao-yang Wang, C. Beckermann

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

1 Scopus citations

Abstract

The effects of thermosolutal melt convection and the transport of solid, in the form of free equiaxed crystals, on the formation of grain structure and macrosegregation in dendritic alloy solidification are studied. Numerical simulations are performed using a recently developed multiphase model that accounts for the nucleation and crystal growth mechanisms taking place at various microscopic length scales, as well as for flow, heat transfer and solute redistribution at the system scale. The predictions are compared to experiments carried out in a square test cell using the transparent NH4Cl-H2O alloy analog. Several important features of equiaxed dendritic solidification are identified, including the grain generation and growth behaviors in the presence of liquid flow, the sedimentation of equiaxed crystals, the formation of a crystal sediment bed, and a bottom zone of negative segregation resulting from the counter-current solid-liquid multiphase flow. Qualitatively good agreement between the measured and predicted cooling curves and evolutions of the crystal sediment bed is achieved. Finally, several areas for future research are indicated.

Original languageEnglish (US)
Title of host publicationProc 1995 7 Conf Model Casting Welding Adv Solid Process
EditorsMark Cross, John Campbell
PublisherMinerals, Metals & Materials Soc (TMS)
Pages549-556
Number of pages8
StatePublished - 1995
EventProceedings of the 1995 7th Conference on Modeling of Casting, Welding and Advanced Solidification Processes - London, UK
Duration: Sep 10 1995Sep 15 1995

Other

OtherProceedings of the 1995 7th Conference on Modeling of Casting, Welding and Advanced Solidification Processes
CityLondon, UK
Period9/10/959/15/95

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Wang, C., & Beckermann, C. (1995). Modeling of combined melt convection and solid transport during equiaxed dendritic solidification. In M. Cross, & J. Campbell (Eds.), Proc 1995 7 Conf Model Casting Welding Adv Solid Process (pp. 549-556). Minerals, Metals & Materials Soc (TMS).