Status of the theory of macroscopic growth instability during directional solidification

Conference · Sun Dec 31 00:00:00 EST 1995

OSTI ID:227820

Richmond, O; Hector, Jr, L G ^[1]

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1. Alcoa Technical Center, Alcoa Center, PA (United States)

Cellular undulation is a condition in which the internal surface of a solidifying shell exhibits geometric irregularities which are large compared to microstructural features. These irregularities, which are periodic ripples, or in some cases raised humps, denote unstable growth of the shell thickness. Casting growth instability leads to a variety of process and product problems such as breakout, undesirable metallurgical structures, surface and subsurface cracking, and surface liquation, which necessitates ingot scalping prior to hot rolling. In this paper, the authors review thermomechanical models of shell growth instability during directional solidification of pure metals and alloys.

• OSTI ID: 227820
• Report Number(s): CONF-9509118-; ISBN 0-87339-297-3; TRN: IM9622%%97
• Resource Relation: Conference: 7. Conference on modeling of casting, welding and advanced solidification processes, London (United Kingdom), 10-15 Sep 1995; Other Information: PBD: 1995; Related Information: Is Part Of Modeling of casting, welding and advanced solidification processes, 7; Cross, M. [ed.] [Univ. of Greenwich, London (United Kingdom). Centre for Numerical Modeling and Process Analysis]; Campbell, J. [ed.] [Univ. of Birmingham (United Kingdom). School of Metallurgy and Materials]; PB: 1030 p.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
99 MATHEMATICS
COMPUTERS
INFORMATION SCIENCE
MANAGEMENT
LAW
MISCELLANEOUS
METALS
SOLIDIFICATION
MATHEMATICAL MODELS
ALLOYS
LIQUID METALS
CASTING
INSTABILITY
INTERFACES
HEAT FLUX
PRESSURE DEPENDENCE
STRESSES
STRAINS
BOUNDARY CONDITIONS
VISCOSITY
DEFORMATION