Abstract
Stress corrosion cracking behavior of austenitic (type 316L) and martensitic (JLF-1LN) steels has been investigated in a supercritical pressurized water (SCPW) environment. Slow strain rate tensile tests were carried out at 673 and 783K at strain rates 6.4×10−4s−1 and 5×10−7s−1 in SCPW of 25MPa pressure and 8ppm dissolved oxygen. Austenitic steel showed a strong strain rate dependence of the total elongation at 783K, while no difference was observed at 673K. At low strain rate, the elongation was reduced at 673K and was accompanied by transgranular stress corrosion cracking. Martensitic steel showed a strong temperature dependence of tensile strength. This is due to the dislocation-rate controlling mechanism or thermally activated mechanism. Scanning electron microscope observations revealed that JLF-1LN steels showed a brittle fracture mode in the limited area close to the specimen surface, while in the case of austenitic steel, transgranular stress corrosion cracking occurred for almost whole specimen cross section.
Published Version
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