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MPS solidification model. Analysis and calculation of macrosegregation in a casting ingotWork performed on several existing solidification models for which computer codes and documentation were developed is presented. The models describe the solidification of alloys in which there is a time varying zone of coexisting solid and liquid phases; i.e., the S/L zone. The primary purpose of the models is to calculate macrosegregation in a casting or ingot which results from flow of interdendritic liquid in this S/L zone during solidification. The flow, driven by solidification contractions and by gravity acting on density gradients in the interdendritic liquid, is modeled as flow through a porous medium. In Model 1, the steady state model, the heat flow characteristics are those of steady state solidification; i.e., the S/L zone is of constant width and it moves at a constant velocity relative to the mold. In Model 2, the unsteady state model, the width and rate of movement of the S/L zone are allowed to vary with time as it moves through the ingot. Each of these models exists in two versions. Models 1 and 2 are applicable to binary alloys; models 1M and 2M are applicable to multicomponent alloys.
Document ID
19850023865
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Poirier, D. R. (Arizona Univ. Huntsville, AL, United States)
Maples, A. L. (General Electric Co.)
Date Acquired
September 5, 2013
Publication Date
May 1, 1985
Subject Category
Metallic Materials
Report/Patent Number
DOC-85HV002
NASA-CR-171589
NAS 1.26:171589
Report Number: DOC-85HV002
Report Number: NASA-CR-171589
Report Number: NAS 1.26:171589
Accession Number
85N32178
Funding Number(s)
CONTRACT_GRANT: NAS8-36039
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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