Integrated Processing and Probabilistic Lifing Models for Superalloy Turbine Disks

摘要

This work developed and applied a probabilistic microstructure-sensitive fatigue analysis of Waspaloy to a turbine disk with realistic processing and in-service loads. Processing residual stresses predicted by a gas turbine OEM were applied to a cyclic symmetry finite element model of a Waspaloy turbine disk. Centrifugal loads and thermal gradients were applied to the model to determine in-service loads. These loads were supplied as inputs to a microstructurally-based probabilistic fatigue model to simulate disk lifetimes. A series of trade studies were performed to determine the effect of varying microstructure (grain and precipitate sizes) in the disk bore, web, and rim on the fatigue life distributions.