Abstract
Stress corrosion crack growth rates were measured on modified wedge-opening load (m-WOL) type specimens of three experimental Ni-Cr-Mo low-alloyed steels in room temperature synthetic sea water. The effects of the cathodic electro-chemical potential of about -980mV vs. Ag/AgCl reference electrode applied by coupling the specimen with Zn-anodes upon crack growth behaviors and upon the threshold stress intensity factor, KIscc, for stress corrosion cracking were investigated. The threshold stress intensity factor for cracking decreases slightly by the cathodic polarization in comparison with that under the freely corroding condition for all the steels tested, showing a tendency to converge with each other for a longer testing duration than over 9000h. The test using the cathodically polarized m-WOL specimen is, therefore, able to be applied as an accelerative method to estimate the threshold stress intensity factor, KIscc.
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