|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||Novel Techniques for Investigation of Cyclic Plasticity in Nickel Base Polycrystals
||Jean-Charles Stinville, W.C. Lenthe, M.P. Echlin, P.G. Callahan, T.M. Pollock
|On-Site Speaker (Planned)
The microstructural configurations that favor early strain localization and fatigue crack initiation at room and high temperatures have been investigated using novel experimental techniques, including high-resolution digital image correlation (HR-DIC), transmission scanning electron microscopy (TSEM) and TriBeam tomography. Cyclic fatigue experiments have been performed on a René 88DT polycrystalline nickel-base superalloy at temperatures up to 650°C. In this context, statistically representative quantitative measurements of strain localization and damage during cyclic loading that are spatially correlated with the microstructure in 2D and 3D have been extracted. HR-DIC has been extended to higher resolution for analysis of discontinuities that evolve during fatigue and to measure quantitatively the plastic localization and strain accumulation at the sub-grain scale and below, where plastic strain localization can be directly correlated with physical slip bands. In parallel, TSEM imaging is opening new pathways for more rapid defect analysis and therefore more statistically representative measurements.
||Planned: Supplemental Proceedings volume