Abstract
The dissolution behavior and kinetics of γ′ precipitates during solution treatment were investigated in an advanced powder metallurgy nickel-based superalloy FGH98. The microstructural evolutions were quantitatively characterized, and the dissolution kinetics were evaluated. The results show that due to the influence of precipitate size and element distribution, the dissolution rate of secondary γ′ precipitates was higher than that of large primary γ′ precipitates, but lower than that of small tertiary γ′ precipitates. With the increase of holding time, the area fractions of γ′ precipitates decreased and then gradually approached a thermodynamic equilibrium for all three heating temperatures. The dissolution kinetics of γ′ precipitates were quantitatively evaluated using the JMAK model. During the initial stage, the dissolution rate decreased rapidly with increasing holding time, and then, changed more slowly. The dissolution activation energy of γ′ precipitates increased with increasing holding time.
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