Calculation of dendrite settling velocities using a porous envelope

H. C DE GROH; P. D WEIDMAN; R ZAKHEM; S AHUJA; C BECKERMANN

doi:10.1007/BF02663135

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Journal article

Calculation of dendrite settling velocities using a porous envelope

H. C DE GROH, P. D WEIDMAN, R ZAKHEM, S AHUJA and C BECKERMANN

Metallurgical transactions. B, Process metallurgy, Vol.24(5), pp.749-753

1993

DOI: 10.1007/BF02663135

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Abstract

The convective transport and gravitational settling of unattached equiaxed grains and dendrite fragments can cause macrosegregation and influence the structure of the equiaxed zone in a variety of solidification arrangements. An understanding of how the highly nonspherical geometry of the dendrite influences its settling and transport characteristics is needed to determine the motion of unattached dendrites and predict structure and segregation in castings. The empirical results of previous works have been used to develop a FORTRAN 77 computer program to calculate the settling velocity of various dendritic shapes and a number of other parameters of interest, such as the volume and surface area of the dendrite. Required inputs to the code are the physical properties of the system and some simple geometric parameters of the dendrite being considered, such as the average radius of the primary arm. The predicted settling velocities were on average within ±5 pct of those measured for model dendrites and were consistent and in good agreement with three other experimental investigations. Future development of the code will attempt to overcome many of its present limitations by including particle-particle interactions and the effects of tertiary arms, for example.

Materials Science

Applied Sciences

Physics

Metals. Metallurgy

Exact sciences and technology

Phase diagrams and microstructures developed by solidification and solid-solid phase transformations

Cross-disciplinary physics: materials science; rheology

Solidification

Details

Title: Subtitle: Calculation of dendrite settling velocities using a porous envelope
Creators: H. C DE GROH - NASA Lewis, Cleveland OH, United States
P. D WEIDMAN - NASA Lewis, Cleveland OH, United States
R ZAKHEM - NASA Lewis, Cleveland OH, United States
S AHUJA - NASA Lewis, Cleveland OH, United States
C BECKERMANN - NASA Lewis, Cleveland OH, United States
Resource Type: Journal article
Publication Details: Metallurgical transactions. B, Process metallurgy, Vol.24(5), pp.749-753
Publisher: American Institute of Mining, Metallurgical, and Petroleum Engineers; Warrendale, PA; Metals Park, OH
DOI: 10.1007/BF02663135
ISSN: 0360-2141
eISSN: 2379-0229
Language: English
Date published: 1993
Academic Unit: Mechanical Engineering
Record Identifier: 9984064556602771

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