The mechanisms of formation and prevention of channel segregation during alloy solidification View Full Text


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Article Info

DATE

1984-12

AUTHORS

A. K. Sample, A. Hellawell

ABSTRACT

Conditions for the formation of macroscopic segregation channels have been examined in the ammonium chloride-water and lead-tin systems, using base chilled molds. Such channels develop when the rejected solute is less dense than the solvent and are therefore a result of density inversion, but slow (≺5 rpm) rates of mold rotation, about axes inclined to the vertical by 20 deg to 30 deg, throughout the time of solidification, effectively prevent the formation or propagation of these channels. Artificially created channels or those momentarily blocked fail to continue and are overgrown, but channels can be initiated by drawing liquid upward from close to the growth front in fine capillaries. Examination of these effects leads to the conclusion that channels originate at the growth front, rather than within the dendritic array, and that their formation is necessarily preceded by a liquid perturbation from the less dense boundary layer into the supernatant, quiescent bulk liquid. Intermittent ‘solute fingers’ are then fed by dendritic entrainment to produce stable convective plumes and concomitant channels. It is considered that the effects of mold precession are primarily caused by translation of bulk liquid across the dendritic growth front, shearing off convective perturbations from the boundary layer before they have time to develop. The nature of the liquid movements is discussed and shown to be a function of the mold dimensions. The inclination of the gravitational vector within the solid-liquid, dendritic array is considered to be of secondary importance to the formation or prevention of channels. More... »

PAGES

2163-2173

References to SciGraph publications

  • 1970-08. The origin of freckles in unidirectionally solidified castings in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1978-12. Macrosegregation in Rotated Remelted Ingots in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1982-09. The effect of mold precession on channel and macro-segregation in ammonium chloride-water analog castings in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1970-05. Interdendritic fluid flow and macrosegregation; influence of gravity in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1970-06. Convective Fluid Motion Within the Interdendritic Liquid of a Casting in METALLURGICAL AND MATERIALS TRANSACTIONS B
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    http://scigraph.springernature.com/pub.10.1007/bf02647099

    DOI

    http://dx.doi.org/10.1007/bf02647099

    DIMENSIONS

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