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Optical microscopy images of as tested C-276 C-rings. Pitting corrosion was evident on the stressed inner edge of the C-rings and on the surface. A more detailed analysis showed that also intercrystalline corrosion had taken place with the loss of occasional grains because of the applied stress in combination with corrosion.
More detailed information can be found in: Daniel Blücher, Torstein Lange, Judit Sandquist, Inge Saanum, Mikko Uusitalo, Corrosion performance of different alloys exposed to HTL conditions—a screening study, Materials and Corrosion 2024, 75, 1258.