Dendrite fragmentation and the effects of fluid flow in castings
In the absence of grain-refining additions to a melt or of any significant heterogeneous nuclei, equiaxed grains can only originate in a casting from primary dendrite fragments. Thus, it is pertinent to understand how dendrites become fragmented and to explain why liquid stirring should appear to "break up" and refine the grain structure. Dendrite fragmentation occursby local remelting, and fluid flow is important as a dispersal mechanism.
Dendrite fragmentation and the effects of fluid flow in castings.
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