Abstract
In order to investigate the influence of aging regimes on the coarsening behavior of γ′ precipitates in CoNi-base superalloy, single and double aging treatments were performed, respectively. For the superalloy after experiencing single aging treatment, the typical γ/γ′ microstructure with coherent γ′ embedded in the matrix is obtained and the coarsening kinetics of γ′ precipitates is in accordance with the Lifshitz-Slyozov-Wagner (LSW) theory. The corresponding coarsening rate increases owing to the addition of γ′ forming elements (Ti and Ni) and the calculated activation energy suggests that coarsening kinetics of γ′ is controlled by diffusion of Ni and Ti in the matrix for the investigated CoNi-base superalloy. Whereas for the superalloy after experiencing the double aging treatment, bimodal size distributions of γ′ precipitates are recognized and a decelerated coarsening of secondary γ′ precipitates in coarsening zone is found as compared with the one after experiencing the single aging treatment, which could be attributed to the effect of primary γ′ precipitates.
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