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Measurement of Strain Localization Resulting from Monotonic and Cyclic Loading at 650°C in Nickel Base Superalloys

Abstract : A methodology is presented for the use of the oxide scale that develops in polycrystalline Ni-base super-alloys at service temperature, as a speckle pattern for μm-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. In the René 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 microstruc-tural configuration that promotes strain localization during monotonic loading and crack initiation at 650 • C in low cycle fatigue was observed.
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Submitted on : Wednesday, December 13, 2017 - 12:38:47 PM
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Jean-Charles Stinville, Mclean P. Echlin, Patrick G. Callahan, Victoria M. Miller, Damien Texier, et al.. Measurement of Strain Localization Resulting from Monotonic and Cyclic Loading at 650°C in Nickel Base Superalloys. Experimental Mechanics, Society for Experimental Mechanics, 2017, 57 (8), pp.1289-1309. ⟨10.1007/s11340-017-0286-y⟩. ⟨hal-01662651⟩

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