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← TechnologyWhich outcome occurs when forging metal exceeds strain hardening limits?
A)Grain boundary fracture initiates✓
B)Recrystallization temperature decreases
C)Dislocation density remains constant
D)Thermal conductivity improves suddenly
💡 Explanation
Exceeding strain hardening during forging causes the **work hardening mechanism** to induce embrittlement, because accumulated dislocations obstruct lattice slip, therefore grain boundary fracture is favored, rather than continued plastic deformation permitted by dislocation glide.
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