Which outcome occurs when exceeding the solidus temperature during closed-die forging of a nickel-based superalloy turbine blade preform?

💡 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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