Abstract
SCC behavior induced by creep of Alloy 690TT in high temperature water was investigated in this study using scanning electron microscopy (SEM) with energy dispersive X-ray (EDS) detector and electron back-scattered diffraction (EBSD) detector. The results showed that the creep cavities could be formed in the stress concentration zones on the interface between the intergranular carbides and matrix. The distribution density of creep cavities was related to the strain level. The cavities mainly distributed on the grain boundaries close to the applied load direction in the high strain zones underneath the scratches. The creep cavities tended to form near the intergranular carbides distributed in a semi-continuous line along the grain boundaries, which was beneficial to the SCC propagation. On the contrary, the local cellular carbides might not be conducive to the formation of creep cavities and inhibited the growth of SCC cracks. In the high strain zone underneath the scratch, the SCC cracks mainly propagated along or close to the direction of applied load.
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