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← TechnologyWhich outcome occurs when exceeding the solidus temperature during closed-die forging of a nickel-based superalloy turbine blade preform?
A)Intergranular separation and hot cracking✓
B)Significant grain refinement throughout the billet
C)Enhanced creep resistance at elevated temperatures
D)Improved surface finish and dimensional control
💡 Explanation
Exceeding solidus temperature during forging leads to localized melting at grain boundaries because of segregation of low-melting-point elements; this causes intergranular separation. Therefore, hot cracking occurs, rather than grain refinement, creep resistance, or surface finish improvement, which demands strictly controlled billet temperature.
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