Which consequence arises from uneven cooling during casting of ancient Chinese cast iron agricultural tools?

💡 Explanation

Internal stress and cracking occur because differential thermal contraction during cooling causes localized stress concentrations via the mechanism of solid-state phase transformation. Therefore, the tool weakens rather than strengthens, as other phase changes would require different conditions.

• Which structural weakness limited the maximum scaling size of Roman ballistae for siege warfare?
• Which consequence resulted from imprecise planispheric astrolabe plate crafting?
• Which consequence resulted when Medieval aqueduct channels calcified?
• Which mechanism led to increased hull flexibility in 18th-century longboats when frame scarcity forced variations to construction methods?
• Which outcome arises when a wooden ship's hull experiences unchecked electrochemical reactions?
• Which navigational risk increased from thermal expansion within early marine chronometers?