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← HistoryWhich outcome can result when bronze is repeatedly cast against uncooled stone molds during mass production?
A)Compositional drift towards higher arsenic
B)Crystalline deformation in bronze lattice
C)Increased surface mold oxidation failures
D)Localized thermal annealing and micro-cracking✓
💡 Explanation
Localized thermal annealing and micro-cracking occurs because repeated pouring of molten bronze against molds induces cyclic heating. The yield strength is exceeded, therefore micro-cracks are introduced, rather than uniform compositional changes typical of other treatments.
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