Which risk becomes more prominent during bronze casting when the crucible overheats?

💡 Explanation

Severe overheating increases the metal's solubility for dissolved gases, activating the gas diffusion mechanism; therefore, gas porosity increases, leading to weaker castings, rather than the dendritic growth or minimized crucible expansion, which are influenced by cooling rates instead.

• Which mechanism ensured the structural integrity of Roman roads during seasonal temperature fluctuations?
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