4.7 Article

Intergranular fatigue crack initiation in polycrystalline copper

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Summary: Studies have shown that the mechanism of fatigue crack initiation in high-angle grain boundaries is controversial. In this research, experiments were conducted on super-austenitic stainless steel Sanicro 25 to study the surface features that developed during cyclic loading with high strain amplitudes. The results revealed the presence of slip markings on the surface of grains, as well as extrusions and intrusions along the surface and normal to the grain boundaries. These processes ultimately weakened the grain boundary and led to the production of grain boundary cracks. These experimental findings challenge the theories suggesting a brittle-like origin of grain boundary cracks.

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