Abstract
The microstructural evolution and oxidation behaviour of CF8A stainless steel during corrosion fatigue (CF) crack initiation and propagation were investigated in a simulated pressurised water reactor environment. Under the action of alternating loads, the near-surface properties of the specimens deteriorate due to the formation of Cr-depleted zones and slip bands (SBs), and CF cracks tend to initiate from SBs on the surface of the specimens. As the CF cracks propagate, dynamic interactions are present between the stress state and the oxidation behaviour at the crack tip due to intense anodic dissolution and the redistribution of stresses and strains.
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