SOLIDIFICATION MODES AND MICROSTRUCTURE OF FE-CR ALLOYS SOLIDIFIED ATDIFFERENT UNDERCOOLINGS

Authors
Citation
Xz. Zhang, SOLIDIFICATION MODES AND MICROSTRUCTURE OF FE-CR ALLOYS SOLIDIFIED ATDIFFERENT UNDERCOOLINGS, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 247(1-2), 1998, pp. 214-221
Citations number
26
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science
ISSN journal
0921-5093
Volume
247
Issue
1-2
Year of publication
1998
Pages
214 - 221
Database
ISI
SICI code
0921-5093(1998)247:1-2<214:SMAMOF>2.0.ZU;2-8
Abstract
The solidification mode and the solidified microstructure of Fe-Cr all oys at various undercoolings have been studied with the electromagneti c levitation method. Different solidification modes have been observed . The undercooling ranges for the different solidification modes have been identified. For undercoolings smaller than about 180-200 K, a den dritic solidification mode was observed, for undercoolings between 200 -220 K and 250-270 K, a cellular solidification mode was detected, whi le for undercoolings larger than about 260-280 K, a planar front solid ification mode produces microsegregation-free microstructure. The pref erence for the formation of the equilibrium BCC phase rather than the metastable FCC phase in solidification at large undercoolings is discu ssed on the basis of nucleation temperature and dendrite grow;th veloc ity calculations. (C) 1998 Elsevier Science S.A. All rights reserved.