Journal
EXPERIMENTAL MECHANICS
Volume 57, Issue 8, Pages 1289-1309Publisher
SPRINGER
DOI: 10.1007/s11340-017-0286-y
Keywords
High resolution digital image correlation; Polycrystalline superalloy; Rene88DT; Strain localization; High temperature fatigue
Categories
Funding
- GE Global Research
- Air Force Center of Excellence [FA9550-12-1-0445]
- Ministere de l'Economie, de la Science et de l'Innovation of Quebec via the Research Support Program (PSR)
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A methodology is presented for the use of the oxide scale that develops in polycrystalline Ni-base superalloys at service temperature, as a speckle pattern for mu m-scale resolution strain measurements. Quantitative assessment of the heterogeneous strain field at the grain scale is performed by high-resolution SEM digital image correlation under monotonic and cyclic loading in polycrystalline Ni-base superalloys up to 650 C-degrees. In the Ren, 88DT superalloy, strain localization is observed near twin boundaries during low cycle fatigue (LCF) at intermediate temperatures, correlating with activation of {111} < 110 and {111} < 112 slip systems. A strong correlation between the microstructural configuration that promotes strain localization during monotonic loading and crack initiation at 650 C-degrees in low cycle fatigue was observed.
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