Which outcome occurs when a large volume of molten metal experiences rapid, uncontrolled cooling in casting?

💡 Explanation

When molten metal cools rapidly after casting, thermal contraction induces substantial stress gradients due to differential cooling rates, causing micro-crack propagation as the material solidifies non-uniformly. Therefore micro-crack propagation occurs, not precipitate formation, martensite or enhanced ductility, which require slower, controlled phase transformations.

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