Undercooling effects in microsegregation modelling
- Technical Univ. of Darmstadt (Germany). Faculty of Materials Science
- Miskolc Univ. (Hungary). Physical Metallurgy Dept.
Numerical simulation of microsegregation phenomena is of continuous interest in solidification modeling and has reached a high level of sophistication. Existing models predict the type and amount of solidifying phases and some microstructural features in conventional castings of binary alloys with sufficient accuracy. For cooling rates exceeding those of technical casting processes, occurring e.g. in surface remelting or welding, undercooling phenomena need to be taken into account. Undercooling of the dendrite tip and delayed formation of interdendritic phases can reduce the amount of nonequilibrium phases significantly. Therefore an existing numerical microsegregation model was extended to very low and high cooling rates by incorporating dendrite tip and eutectic undercooling effects. In this paper it is investigated to what degree the differences of the undercooling models influence the results of microsegregation calculations, with the aim to select the appropriate description of undercooling for microsegregation modelling. As model systems an Al-Cr alloy are selected.
- OSTI ID:
- 271650
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 1 Vol. 35; ISSN 1359-6462; ISSN XZ503X
- Country of Publication:
- United States
- Language:
- English
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