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Cast Alloy 7 18 was evaluated in compression over a range of temperatures (900 to 1 120°C), strain rates (0.01 to 1.0 s-l), and true strains (0.15 to 0.7). Under most conditions evaluated, flow curves exhibited no peaks, indicating that dynamic recrystallization was not playing an important role. The percentage of static recrystallization was found to vary with temperature, strain rate, true strain, and time held at temperature after deformation. Recrystallized grain size values were also determined. A material model describing percent recrystallization and recrystallized grain size was established based on the experimental data. In addition, double hit compression tests were conducted to determine the effect of delay time between passes during ingot breakdown. For most cases the percent recrystallization after double hit was simply the sum of two individual hits under corresponding conditions.

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