Abstract
The purpose of this work is to understand the quantitative processes which are the underlying causes of the initiation of stress corrosion after long-term exposures in high-temperature water. Crack initiation tests were performed using blunt-notched compact-tension type specimens of cold-worked (CW) carbon steel (ASTM A106 [UNS K03006]), CW mill annealed Alloy 600 (UNS N06600, MA600), and CW thermally treated alloy 690 (UNS N06690, TT 690), which were exposed in air, hydrogenated pure water, and in the primary coolant environment in pressurized water reactors (PWR) under static load condition in the range of temperatures between 360 and 465°C. Four important patterns were observed: first, intergranular cracking was observed in all tested materials, even in those exposed in air, under static load conditions when materials had been cold worked. Secondly, 1/T type temperature dependencies of initiation times were observed for CW carbon steel; the crack initiation time in an operating plant (Point Lepreau Nuc...
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