|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Fatigue Deformation Mode in a Polycrystalline Nickel Base Superalloy at Intermediate Temperature: Oxidation Assisted Process
||J.C. Stinville, M.P. Echlin, P.G. Callahan, W.C. Lenthe, J. Miao, T.M. Pollock
|On-Site Speaker (Planned)
At component service temperatures, the effect of the environment on fatigue life of polycrystalline nickel-base turbine disk superalloy may be significant. Oxidation assisted processes that induce fatigue initiation for specific conditions are closely correlated with strain localization and microstructural configuration. A major challenge is to understand the strong dependence of the environmental effect that operates during fatigue in relation to the microstructure of the alloy. Therefore, experimental data on fatigue initiation induced by oxidation assisted processes spatially correlated with the microstructure has been gathered using HR-SEM digital image correlation and TEM analysis. Crack initiation by oxidation-assisted mechanisms is detailed for a René 88DT polycrystalline nickel-base superalloy during fatigue at intermediate temperature. This process is observed to control the fatigue lifetime at high stresses. Moreover, the specific microstructural configurations and plastic deformation modes that lead to crack initiation by oxidation assisted process during fatigue at intermediate temperature have been identified.
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