Which outcome occurs as cast iron cools unevenly?

💡 Explanation

Internal stresses rise during solidification because differential cooling rates create uneven shrinkage; this causes cracking via thermal stress concentrations rather than grain migration or changing material properties uniformly, therefore only internal stresses will weaken its structure.

• Which destructive outcome was frequently encountered early in shipbuilding history when green timbers were enclosed within impermeable layers?
• Which failure can undermine buildings using 'pietra dura'?
• Which challenge complicates siege tower use in ancient Mesopotamia?
• Which communication failure occurred when the Inca used quipu to convey maize harvest totals across changing altitude zones?
• Which risk increased during pre-Columbian chinampa cultivation when canals experienced excessive nutrient loading?
• Which outcome arose because quipu maintenance lacked standardization?