MODELING OF INTERNAL-STRESS DISTRIBUTION AND DEFORMATION-BEHAVIOR IN THE PRECIPITATION-HARDENED SUPERALLOY SC16

The deformation behaviour, at elevated temperatures, of the single cry stal nickel-base superalloy SC16 has been modelled. The constitution o f the alloy consists of the precipitates of the ordered gamma' phase e mbedded in a gamma (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 al elevated temperatures. The mod el allows both the gamma and gamma' phases to deform inelastically. Si mulations were performed for (001) orientation of the specimen. The Fi nite Element code ADINA was employed for 3D stress/strain analysis. Th e mechanical data of this alloy have not been used to determine parame ters for the model. The model predictions of the creep rate are in fai r agreement with the experimental observations and also allow qualitat ive interpretation of deformed microstructures. (C) 1998 Elsevier Scie nce S.A.