The aim of the presented contribution has been to upgrade the previous SCC research [1,2] done under normal temperatures and pressure. Current research is monitored at higher pressures and ...temperatures, environments being similar and characteristic to the nuclear environments. The focus was to apply the previous knowledge in order to detect SCC and other degradation processes. Thecombined use of different techniques, such as electrochemical noise (EN) analysis, acoustic emission (AE) analysis, elongation measurements were applied to study SCC in the autoclave environment. Presented results were obtained by slow strain rate tensile tests (SSRT) on thermally sensitized austenitic stainless steel (AISI 304) specimens under simulated BWR condition (T = 288°C, p = 71 bar, conductivity of water ~3 ŽS/cm). Additionally, a scratching device was used to mechanically damage the specimen surface with the aim of a surface passive film rupturing as the film rupture could be one of the mechanisms for crack initiation. EN and AE signals were measured and analyzed during the experiments. Additionally, some other important experimental parameters were monitored during the experiment: force on a specimen, elongation of a specimen, autoclave pressure, and temperature. Aftereach experiment, specimens were inspected for cracks and other damages bydifferent techniques with the emphasis on SEM and X-ray microtomography. In order to detect and characterize degradation process of specimen signals of EN, AE and force were analyzed and correlated. By correlation of signals characteristics several processes were successfully detected and explained: final failure of the specimen, corrosion due to increase of temperature, scratching of working and reference electrode and to the some extend also presence of SCC. Detected damages on and inside the specimen were additionallycharacterized and confirmed by SEM and X-ray microtomography.
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