A new set of fracture mechanics stress corrosion crack growth rate data is presented for transgranular cracking of reactor pressure steels in high temperature water. The essential observations are as follows. Fast stress corrosion crack growth rates between 10-9 and 10-8 m/s may be observed down to 400 ppb dissolved oxygen at water conductivities of 1.0 μS/cm in refreshed autoclaves. Stress corrosion crack growth could not be observed below minus 270 mV on the hydrogen scale. Low and medium sulfur contents in the steels have no measurable influence on the stress corrosion crack growth rates in 288°C water with a conductivity of 1.0 μS/cm.

Subject
Sulfur, Pressure vessels, Crack growth, Water, Corrosion rate, Transgranular stress corrosion cracking, Corrosion growth, Steel, Oxygen, Dissolved oxygen, Stress corrosion cracking, Conductivity, Electrode potential
Keywords:
reactor pressure vessel steel, transgranular stress corrosion cracking in water, effect of dissolved oxygen, potential, sulfur
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1994
Association for Materials Protection and Performance (AMPP)
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