Journal article
A truncated-Scheil-type model for columnar solidification of binary alloys in the presence of melt convection
Materialia, Vol.7, p.100364
09/2019
DOI: 10.1016/j.mtla.2019.100364
Abstract
A two-phase truncated-Scheil-type model is developed for columnar solidification of binary alloys in the presence of melt convection and liquid undercooling ahead of the primary dendrite tips. The model is derived from a three-phase model, which takes into account liquid undercooling ahead and behind the primary tips. These models are used to simulate a numerical solidification benchmark problem, and their predictions are compared with those of a Scheil-type model that disregards liquid undercooling and solute diffusion in solid. Simulation results reveal that the predictions of the truncated-Scheil-type and three-phase models are nearly identical, indicating that undercooling behind the primary tips can be disregarded and the truncated-Scheil-type model can replace the significantly more complex three-phase model. The truncated-Scheil-type and three-phase models smoothly recover the Scheil-type model as the value of the dendrite tip selection parameter is increased. Taking into account liquid undercooling changes the melt convection pattern around the columnar front and the form of channel segregates but does not change the overall macrosegregation pattern.
Details
- Title: Subtitle
- A truncated-Scheil-type model for columnar solidification of binary alloys in the presence of melt convection
- Creators
- M Torabi RadC Beckermann - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Materialia, Vol.7, p.100364
- DOI
- 10.1016/j.mtla.2019.100364
- ISSN
- 2589-1529
- eISSN
- 2589-1529
- Grant note
- DOI: 10.13039/100000104, name: NASA, award: NNX14AD69G
- Language
- English
- Date published
- 09/2019
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984196623102771
Metrics
6 Record Views