Abstract
Specimens of the nickel base alloy IN 718 deformed at high strain rate (approximately 10 s(-1)), as realized in a screw press, have higher strength than parts forged conventionally in a hydraulic press. Microstructure analyses in light and transmission electron microscopes reveal the precipitation of very small Ni(3)Nb particles (gamma"-phase) to be the reason for the increased hardness. Several processing routes are discussed and analyzed in relation to the TTT-diagram of IN 718.
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