Creep Life Prediction of Thermally Exposed Rene 80 Superalloy

The effects of long time thermal exposure on the microstructure and mechanical properties of Rene 80 superalloy were investigated by means of scanning electron microscopy and accelerated creep tests at 190 MPa and 980 °C. Results obtained showed that the rupture lives of pre-exposed samples decreased by increasing the exposure time or exposure temperature. In addition, as a new finding the concept of contour maps of the constant life and minimum creep rate were introduced. These maps were used to estimate the effect of exposure time and exposure temperature on the creep rupture life and minimum creep rate of thermally exposed samples.