Thermal treatment, grain boundary composition and intergranular attack resistance of Alloy 690
Conference
·
OSTI ID:48121
- Sheffield City Polytechnic (United Kingdom)
Commercial Alloy 690 PWR steam generator tubes and experimentally produced alloys with varying amounts of carbon, aluminium and titanium have been examined. After simulated mill annealing and thermal treatment, the microstructure and corrosion behaviour in corrosion tests have been investigated. Stress corrosion resistance of selected alloy 690 tubes and experimental alloys has been examined with environments based on pure water, sodium hydroxide and sodium hydroxide + sodium sulphate solutions. Effects of aluminium content and the thermal treatments on the susceptibility to intergranular attack have been examined, although they appear not to be very significant to the amounts of IGA. Samples used in thermal treatments have been further examined with a dedicated scanning transmission electron microscope to show compositional changes at grain boundaries.
- OSTI ID:
- 48121
- Report Number(s):
- CONF-910808--
- Country of Publication:
- United States
- Language:
- English
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