Structural changes in high-temperature creep and annealing within the temperature range 825–1175K are discussed with the aim of determining the effect of M23C6 and probably also γ-Ni3(AI, Ti) precipitation strengthening in creep. Though no precipitation of γ’ was detected under the present conditions, dislocation motion at lower temperatures, i.e. 825–975 K, was influenced by the short-range ordering of the alloy. The effect of M23C6 precipitation on dislocations at higher temperatures, 975–1175 K, represents a limiting value of the applied stress necessary for straining of the annealed specimens and contributes to the internal stress on creep.
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