Abstract
A new thermomechanical treatment that permits a significant increase in the time to failure, as well as the resistance in stress rupture tests of the hard aged nickel-based alloys has been proposed. It is shown that new treatment consisting of a small prestrain in creep regime and subsequent one- or two-step aging brought about the formation of a high-dispersed microstructure of gamma-prime phase particles from several nm to 50 nm. This microstructure is more stable towards coarsening upon subsequent annealing. Improvement of the mechanical and creep properties is explained by a stable microstructure of the alloy, produced by the thermomechanical treatment, a higher degree of order inside particles, and coexistence of the mechanisms of cutting and by-passing of particles by single and pair dislocations.
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