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This document summarizes research on stress corrosion crack initiation in Alloy 690 exposed to high temperature water. It finds that crack initiation is rarely observed and depends on the loading method. Constant deflection and load tests often show no cracking due to stress relaxation and an inability to rupture the protective oxide film, respectively. In contrast, cracking is consistently seen in dynamic straining experiments. The document proposes a three-stage mechanism for crack initiation: 1) oxidatio

Author

HASAN IZHAR KHAN

Language

EN