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Which risk increases when casting molten metal around a hydrothermally unstable core?

A)Bridging defects become more probable
B)Thermal expansion will create voids
C)Porosity from gas evolution increases
D)Chemical segregation creates alloy banding

💡 Explanation

Higher temperatures provoke decomposition, a process called thermal decomposition, in hydrothermal cores creating additional gas. Because the solubility of gas decreases with cooling temperature, porosity from gas evolution increases with unstable core material rather than material of low binding energy; therefore it increases porosity.

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