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Convective transport phenomena and macrosegregation during solidification of a binary metal alloy. I. Numerical predictions

Journal Article · · Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States)
DOI:https://doi.org/10.1115/1.2910929· OSTI ID:6956298
 [1];  [2]
  1. Pennsylvania State Univ., University Park, PA (United States)
  2. Purdue Univ., West Lafayette, IN (United States)
+ Show Author Affiliations

A continuum model is used to simulate transient convective transport phenomena numerically during solidification of a Pb-19 percent Sn alloy in an experimental rest cell. Solidification occurs in an axisymmetric, annular mold of stainless steel, cooled along its outer vertical wall. Results show that, during early stages of solidification, double-diffusive convection and liquid exchange between melted and mushy zones are responsible for the formation of channels in the outer periphery of the ingot, which ultimately lead to a form of macrosegregation known as A-segregates. During intermediate stages of solidification, solutally driven natural convection spawns a cone segregate in the interior region of the ingot. The final macrosegregation pattern is characterized, in general, by increasing Sn concentration with increasing height throughout the ingot and by increasing Sn concentration with decreasing radius in the upper portion of the ingot. 43 refs., 7 figs., 1 tab.

DOE Contract Number:
FG02-87ER13759
OSTI ID:
6956298
Journal Information:
Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 116:3; ISSN JHTRAO; ISSN 0022-1481
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALLOY SYSTEMS
ALLOYS
BINARY ALLOY SYSTEMS
CASTING MOLDS
CONVECTION
ENERGY TRANSFER
HEAT TRANSFER
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
LEAD ALLOYS
MASS TRANSFER
MATHEMATICAL MODELS
PHASE TRANSFORMATIONS
SOLIDIFICATION
STAINLESS STEELS
STEELS
TIN ALLOYS