Prediction of uniaxial tensile properties and stress rupture properties for GH3230 superalloy

GH3230 superalloy is widely used in the fields of aero-engine and nuclear industry. Due to its extensive application, the accurate assessment of service life of its components highly relies on the precise prediction of uniaxial tensile properties and stress rupture life. This paper focuses on investigating uniaxial tensile properties of this superalloy at different temperatures, as well as its stress rupture life under various combinations of temperature and stress. Correspondingly, the R-O constitutive model and the Chaboche constitutive model are established to describe the tensile behaviour of the alloy, while the isothermal line extrapolation method and the L-M parameter model are developed for predicting its stress rupture life. The results indicate that in terms of predicting uniaxial tensile properties, compared to the Chaboche constitutive model, the R-O model can only reasonably predict the stress near the yield point, showing a significant deviation in the overall prediction trend of the stress-strain curve. In contrast, the Chaboche constitutive model can more effectively describe the tensile behaviour of the GH3230 superalloy, with fitting correlation coefficients close to 0.9 at most test temperatures. Regarding the prediction of stress rupture life, both the isothermal line extrapolation method and the L-M method demonstrate high prediction accuracy. These models are capable of providing reasonable predictions for the stress rupture life of the superalloy under different service conditions.