|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||L-84: The Effects of Microstructure on Fatigue in a Polycrystalline Nickel Base Superalloy at Intermediate Temperature
||J.C. Stinville, M.P. Echlin, P.G. Callahan, W.C. Lenthe, E. Marin, J. Miao, T.M. Pollock
|On-Site Speaker (Planned)
Robust models for fatigue and the variability in this property could provide substantial enhancements to the design, processing and life prediction of alloy components. A major challenge is the strong dependence of the intrinsic plastic deformation processes that operate during fatigue on the microstructure of the alloy involving localized accumulation of plastic strain and ultimately crack initiation and propagation. In this context, statistically representative measurements of strain localization and damage during cyclic loading that are spatially correlated with the microstructure have been collected through advanced experimental techniques. The specific microstructural configurations that induce crack initiation in a René 88DT polycrystalline nickel-base superalloy during fatigue at intermediate temperature have been identified. Transmission electron microscopy has been conducted at these specific microstructural configurations to characterize the dislocation sub-structure that promotes fatigue crack initiation. Results are discussed for varying temperatures and in relation to the fatigue life (S-N plot) of the René 88DT.
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