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Which limitation arose when bronze casting molds underwent repeated cycles?

A)Increasing surface crack propagation
B)Faster reaction kinetics of silica
C)Reduced heat transfer coefficient
D)Higher mold volumetric thermal expansion

💡 Explanation

Crack propagation increased, because thermal cycling caused stress concentrations at defects, leading to fracture mechanics-based failure. Therefore, cracks grew with each cycle, rather than the silica reaction limiting the mold, because alternative processes become dominant before reaction completion.

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