Modelling of internal stress distribution and deformation behaviour in the precipitation hardened superalloy SC16

The deformation behaviour, at elevated temperatures, of the single crystal nickel-base superalloy SC16 has been modelled. The constitution of the alloy consists of the precipitates of the ordered γ′ phase embedded in a γ (f.c.c. solid solution) matrix. The material model used incorporates the ideas based on the current understanding of the deformation mechanisms in this alloy at elevated temperatures. The model allows both the γ and γ′ phases to deform inelastically. Simulations were performed for (001) orientation of the specimen. The Finite Element code ADINA was employed for 3D stress/strain analysis. The mechanical data of this alloy have not been used to determine parameters for the model. The model predictions of the creep rate are in fair agreement with the experimental observations and also allow qualitative interpretation of deformed microstructures.