Which early outcome resulted from imperfect control during Song Dynasty gunpowder cast iron casting?

💡 Explanation

Rapid mold overheating and embrittlement occurs because improper gunpowder mixture control leads to unexpected exothermic spikes in internal mold temperatures, therefore weakened metal results rather than desired material properties at set temperatures.

• Which risk increased within Sumerian canals if the flow velocity decreased below a critical threshold during irrigation?
• Which risk increases when Bronze Age artisans repeatedly cold-work a bronze blade without annealing?
• Which early consequence resulted from fiber rot within Viking longship rigging?
• Which structural weakness can result when curing green timbers within a stacked sailing vessel hull?
• Which function did the 'Equation of Time' serve in pre-18th century astronomical timekeeping?
• Which mechanical effect during a Roman siege increases if catapult timbers are persistently waterlogged?