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Abstract
The features of deformation of high-alloy heat-resistant nickel alloys for disks of gas turbine engines of the Ni–Co–Cr–W–Al–Nb–Ti–Mo system (EP962, EK151, and EP975 type) have been studied near the temperature of complete dissolution of the strengthening γ' phase. Analysis of the deformation curves has shown that the softening processes are controlled by dynamic recrystallization, and the greatest decrease in the flow stress in the two-phase region is observed at a temperature of ~20°C below the complete dissolution of the γ' phase, which is associated with the presence of ~10% of γ' particles larger than 1.5 μm.
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