Effects of sensitization and crevices on critical cracking potential for SCC of Alloy 600
- Hitachi Ltd. (Japan)
- Tohoku Univ., Sendai (Japan)
Effects of sensitization and crevices on critical cracking potential for stress corrosion cracking (SCC) of Alloy 600 were evaluated by slow strain rate tests (SSRTs). Tests were conducted under both potentiostatic controlled, and under free corrosion potential, conditions. For the former, boric acid and lithium hydroxide were added to pure water to maintain sufficient conductivity. Crevices were formed by inter-granular corrosion and wrapping stainless steel foil around the specimen. All tests were performed in 288{degrees}C water and applied strain rate was 7x10{sup {minus}7} (1/s). For the potentiostatic controlled condition, it was found that above a certain threshold potential SCC susceptibility increased with increasing applied potential. Sensitization lowered the critical cracking potential by around 200mV and inter-granular crevices shifted it even lower, by about 250mV. The critical cracking potentials obtained were not less than 200mV vs SHE, which is higher than those of sensitized stainless steel (0 to -230mV) and low alloy steel (-100 to -250mV).
- OSTI ID:
- 48052
- Report Number(s):
- CONF-910808--
- Country of Publication:
- United States
- Language:
- English
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