NDLI: Effect of Grain Refinement on Structure Evolution, “Floating” Grains, and Centerline Macrosegregation in Direct-Chill Cast AA2024 Alloy Billets

Content Provider	Springer Nature Link
Author	Nadella, R. Eskin, D.G. Katgerman, L.
Copyright Year	2007
Abstract	Direct-chill (DC) cast billets 192 mm in diameter of an Al-Cu-Mg alloy were examined in detail with the aim to reveal the effects of grain refining (GR) and casting speed on structure, “floating” grains, and centerline macrosegregation. Experimental results show that grain size and dendrite arm spacing (DAS) tend to coarsen toward the billet center with a local refinement DAS in the center. In GR billets, grain size does not change much with the cooling rate, casting speed, and grain refiner amount. Coarse-DAS (floating) grains are observed around the billet axis regardless of GR and the amount of Ti, though their amount is significantly higher in GR billets. Macrosegregation profiles show a negligible influence of GR, while the effect of casting speed is large. The concept of solute-depleted floating grains contributing to the centerline macrosegregation is substantiated by microsegregation measurements, which show that, independent of GR, coarse dendrite branches have a depleted concentration plateau in contrast to the fine dendrite arms.
Starting Page	450
Ending Page	461
Page Count	12
File Format	PDF
ISSN	10735623
Journal	Metallurgical and Materials Transactions A
Volume Number	39
Issue Number	2
e-ISSN	15431940
Language	English
Publisher	Springer US
Publisher Date	2007-12-13
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ceramics, Glass, Composites, Natural Methods Physical Chemistry Structural Materials Metallic Materials Materials Science
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Condensed Matter Physics

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