Characterization of creep damage and lifetime in Inconel-713C nickel-based superalloy by stress-based, strain/strain rate-based and continuum damage mechanics models

This article has presented suitable creep lifetime prediction models for Inconel-713C nickel-based superalloy. For such objective, the characterization of the creep damage and lifetime has been performed by considering stress-based model, strain/strain rate models and continuum damage mechanics models. For calibrating material models, creep tests at 850 °C have been performed on the Inconel-713C nickel-based superalloy under different stress levels. Obtained results indicated that reliable/valid models, according to a proper relative error and a low scatter-band, were the Monkman-Grant strain rate-based model and the continuum damage mechanics model. The scanning electron microcopy (SEM) analysis showed that the matrix pattern of crept specimens changed, when the applied stress changed under creep loading. In addition, the one-dimension form could be considered for the shape of carbides. (paper)