718 Alloy

Alloy name: 718
Diagram No.: 1070
Type of diagram: RTT
Chemical composition in weight %: 51.5% Ni, 19.9% Fe, 18.2% Cr, 5.1% Nb, 2.9% Mo, 1.15% Ti, 0.57% Al, 0.035% C
Alloy group: Nickel-based alloys
Note: Recrystallization-Temperature-Time surface map for Alloy 718 under dynamic and static conditions.
The temperature-recrystallization-time map for IN-718 alloy determined at epsilon=0.2 and epsilon=O.5/3is presented in Figure. This figure describes the recrystallization behavior of this alloy under dynamic and static conditions. The samples used in this part of the study were homogenized at 118O C for 24 hrs. The time coordinates represent the holding time at deformation temperature prior to quenching. The results shown in this figure indicate a series of points: (1) at deformations equal to or less than epsilon=O.2, full dynamic recrystallization can take place if the deformation process occurs at very high temperatures, that is above 2150 F (1177 C); (2) at lower temperatures, about 1960 F (1071 C) full recrystallization can be obtained under static conditions; (3) partial recrystallization is obtained between 1960 and 1780 F (1071 to 962 C); (4) below 1780 F the fully unrecrystallized zone is observed. The results presented in Figure 5 also defines the recrystallization-stop temperatures, T(100%), and T(05) for IN-718 alloy under the TMP conditions used in this study.
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