Effect of External Heat Extraction on Dendritic Growth into Undercooled Melts

Solidification characteristics in most rapid solidification processes are controlled by heat extraction by the chill substrate and by melt undercooling, especially near the substrate. A dendrite growth model for this situation is derived in the present study. The model involves combined effects of t...

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Bibliographic Details
Published inISIJ International Vol. 35; no. 6; pp. 611 - 617
Main Authors Koseki, Toshihiko, Flemings, Merton C.
Format Journal Article
LanguageEnglish
Published The Iron and Steel Institute of Japan 01.01.1995
Subjects
chill casting
dendrite tip model
dendritic growth
heat extraction
morphological stability
rapid solidification
undercooling
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Summary:Solidification characteristics in most rapid solidification processes are controlled by heat extraction by the chill substrate and by melt undercooling, especially near the substrate. A dendrite growth model for this situation is derived in the present study. The model involves combined effects of the undercooled melt and the substrate as effective heat sinks. A dendrite is assumed to grow into an undercooled melt, with heat evolution at the dendrite tip occurring both into the undercooled melt and into the chill substrate through the growing solid. The significance of the proposed dendrite model and the stability of dendrite growth under the thermal conditions considered are discussed, using the Fe-Cr-Ni alloy system as an example.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.35.611