Recently it has been reported that the basic mechanism of Primary Water Stress Corrosion Cracking (PWSCC) is a type of HE(hydrogen emblittlement) and the role of hydrogen in the metal may be to accelerate low temperature creep, according to the results of the hump-SSRT(Slow Strain Rate test) tests and the rapid straining electrode tests using Ni based alloys and austenitic stainless steels. However there is a big difference between the cracking behavior of a Ni based alloy and austenitic stainless steel under static stress and strain condition such as constant load test or reverse U-bend test. Ni based alloy has susceptibility to PWSCC under such condition, but austenitic stainless steel does not. In this paper these difference between a Ni base alloy and austenitic stainless steels will be discussed based on the mechanism of PWSCC.

Subject
Hydrogen induced cracking, Strain rate, Primary water, Stainless alloys, Nickel based alloys, Cathodic current, Hydrogen gas, Hydrogen electrodes, Stress cracking, Stainless steel, Electrodes, Hydrogen, Hydrogen stress cracking
Keywords:
PWR, SCC, PWSCC, N06600 (alloy 600), S30400 (SUS304), S31600 (SUS 316), hump-SSRT test, cathodic potential, Inter-Granular(IG) cracking, high purity hydrogen gas
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2013
Association for Materials Protection and Performance (AMPP)
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