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A deformation map, or microstructural map, has been developed for Alloy 718. This map defines microstructures that are obtained as a function of temperature, strain rate, and strain when forging fine grain Alloy 718 billet. The map delineates regions of different microstructural features such as uniform grain structures resulting from dynamic recrystallization, necklace grain structures resulting from dynamic recrystallation occurring only at grain boundaries present when deformation commences, and shear bands resulting from flow localization. The microstructural data used in the map were obtained by analysis of compression specimens. The compression testing procedures are described and some issues related to the conduct of testing are discussed. For example, details of the microstructural map obtained are sensitive to test parameters such as time at temperature before deformation, lubrication, cooling rate after testing, and of course, billet chemistry and starting microstructure. The utility of the map in forge process design is discussed. Superalloy 718-Metallurgy and Applications Edited by E.A. Loria The Minerals, Metals & Materials Society, 1989

Progress Toward a Deformation Map for Fine Grain Alloy 718 Billet