Nucleation condition

Nucleation conditions, in interaction with the cooling conditions (see Cooling rate, Cooling time), influence supercooling in eutecticsolidification.

In turn, the nucleation conditions are influenced by the charge materials, temperature control during melting and subsequent inoculation treatment. Today, it is assumed that oxides, carbides, sulfides and non-dissolved graphite act as nucleation-promoting substances.

Favorable nucleation conditions result in eutecticsolidification with a low degree of supercooling that is performed on the basis of the dual system, preferably in the stable system. Hindrances and complications in nucleation change the conditions towards meta-stable solidification through increased undercooling.

Additional references:
Iron-carbon phase diagram
Eutectic graphite quantity
Eutectic grain count
Eutectic alloy
Eutectic cast iron
Nucleus
Balance of nuclei 

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