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← ScienceWhich outcome occurs within molten steel when its cooling rate increases through its solidification temperature?
A)Grain boundary phase segregation increases
B)Dendritic arm spacing decreases✓
C)Equiaxed grain size distribution increases
D)Peritectic transformation equilibrium is reached
💡 Explanation
Decreasing the cooling rate of molten steel causes decreased dendritic arm spacing because faster heat removal reduces diffusion distance affecting the SOLUTE SEGREGATION mechanism. Therefore, faster cooling makes finer structures, rather than changing other phase equilibrium behavior or boundary segregation trends.
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