Long description of figure

Dual microstructure heat treatment produces a fine grain microstructure in the bore and a coarse grain microstructure in the rim of the low-solvus, high-refractory-powder metallurgy superalloy disk. This gives optimal strength, fatigue, and creep resistance to 704°C for the cooler running turbine disk bore, and optimal strength, creep, and dwell fatigue crack growth resistance at high temperatures for the hotter running rim.

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