The reduction of dendrite ARM spacing using a novel pressure-assisted investment casting approach

Dendritic structures are the predominant microstructural constituents of solidified alloys. The primary, and more often the secondary, dendrite arm spacings control the segregation pattern that largely determines the properties of the material. It is advantageous to refine the dendritic arm spacing...

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Veröffentlicht in:Journal of materials processing technology 1997-10, Vol.70 (1), p.99-102
Hauptverfasser: Lim, C.S., Clegg, A.J., Loh, N.L.
Format: Artikel
Sprache:eng
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Zusammenfassung:Dendritic structures are the predominant microstructural constituents of solidified alloys. The primary, and more often the secondary, dendrite arm spacings control the segregation pattern that largely determines the properties of the material. It is advantageous to refine the dendritic arm spacing (DAS) in castings. In this respect, there is a technological advantage to refine the DAS in conventional investment casting. In this paper, the authors describe a newly developed pressure-assisted investment casting process which produces lower DAS values in cast LM25 alloy as compared to those of the conventional investment casting process. The values of DAS obtained in this process were, however, much higher than those of the squeeze-casting process.
ISSN:0924-0136
DOI:10.1016/S0924-0136(97)00044-7