The effect of apparent strain rate on primary water stress corrosion cracking (PWSCC) of alloy 600(UNS N06600), 304 and 316 stainless steels(UNS S30400 and S31600) was studied at 360°C at apparent strain rate ranging from 1×10-7 to 1×10-5 s-1 using the slow strain rate tensile technique (SSRT). It was revealed that the PWSCC fracture mode of these materials changes with strain rate and the crack growth rate has a maximum. The total brittle fracture decreases with increasing strain rate; however, the fraction of transgranular(TG) mode in the brittle fracture increases with increasing strain rate, i.e., the fraction of intergranular(IG) fracture increases with decreasing strain rate and the fraction of TG decreases in order of alloy 600, 316 and 304 stainless steel. The mechanism for the fracture mode change may be possibly explained by a similar mechanism of PWSCC and the difference of stacking fault energy for these materials.

Subject
Strain rate, Primary water, Crack growth, Steel surfaces, Materials, Intergranular stress corrosion cracking, Stainless alloys, Nickel based alloys, Transgranular stress corrosion cracking, Micrography, Stainless steel, Fracture, Test specimen
Keywords:
alloy 600(UNS N06600), austenitic stainless steel(UNS S30400 and S31600), stress corrosion cracking, primary water, transgranular, intergranular, strain rate, SSRT
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2004
Association for Materials Protection and Performance (AMPP)
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