Abstract
A modelling approach is developed for the description of microstructure formation in the industrial AM1 Ni-base superalloy. Solidification and homogenization simulations are first carried out using a microsegregation model, before using the local compositions as an input for precipitation calculations, in order to characterize the influence of segregation on precipitation. First, the precipitation model was validated by comparing simulated and measured evolutions of the average precipitate radius during isothermal heat treatments at 1100 ∘ C and 1210 ∘ C. The chained microsegregation and precipitation simulations indicate that the global sequences of precipitation events remains are qualitatively the same at the different locations in the microstructure, but the growth and dissolution kinetics are strongly influenced by the local compositions. Local supersaturations have a larger effect on the average radius of the precipitates than certain stages of the precipitation heat treatment.
Highlights
Ni-base superalloys are widely used for aeronautical applications due to their outstanding mechanical properties at elevated temperatures
In the as-cast state, the presence of residual γ /γ eutectic in the interdendritic areas and high composition gradients in the primary γ phase are not desired since they do not allow to reach the optimal properties of the alloys
pseudo-front tracking technique (PFT) simulations were performed for three domain sizes using 1D cylindrical coordinates, in order to assess the effect of λd on the dissolution/homogenization kinetics
Summary
Ni-base superalloys are widely used for aeronautical applications due to their outstanding mechanical properties at elevated temperatures. This behavior is strongly dependent on the fraction and average size of the hardening γ precipitates in the γ matrix. Heat treatments are performed to dissolve the eutectics, homogenize the composition in the primary solid, and during ageing at lower temperature, form γ precipitates with a controlled size in the supersaturated γ matrix. The goal of this work is to study the effect of an incomplete solution heat treatment on the spatial distribution of the γ precipitates in the supersaturated γ matrix. Microsegregation and precipitation models are applied to the industrial AM1 superalloy
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