Study of Damage Mechanisms in Cyclically Strained MAR-M247

The fatigue hardening, softening, and crack initiation on the MAR-M247 superalloy were observed and measured at different temperatures. The plastic strain localization resulted in the formation of persistent strip markings on the surface of specimens. The surface relief after low cycle fatigue tests at 23 °C, 700 °C, and 800 °C was observed using our AFM LiteScope in tapping mode. The Correlative Probe and Electron Microscopy (CPEM) enabled the reconstruction of the surface in 3D, combining the best of HRSEM and AFM techniques.

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