Lifetime evaluation of hot forged aerospace components by linking microstructural evolution and fatigue behaviour

摘要

The present work aims at linking the local distribution of fatigue strength in a forged part to its manufacturing process. To this purpose, a predictive fatigue strength model for Inconel 718, also including the operating temperature, is derived from a reduced set of numerous microstructural parameters. The model is implemented, along with a microstructural evolution model from earlier work [4], into a finite element code in order to predict the local fatigue strength distribution in a component after being subjected to an arbitrary forging process.