Abstract
Stress corrosion behaviors of Type 304 stainless steel wire in 2 kmol/m3 H2SO4-NaI at 368 K were examined under an initial stress of 324 MPa as functions of the amount of α′ martensite induced by prestraining at various temperatures and NaI concentration. The attack like cracks was observed in the steel with a little α′, particularly in the steel prestrained at 293 K and tested in a solution containing 5×10−2 mol/m3 NaI. The attack, however, was blunt and tended to develop into trenches and/or hollows for the steel with a large amount of α′ in the solution with 5×10−2 mol/m3 NaI, or with a little α′ with NaI concentrations below 10−2 mol/m3. This may be due mainly to the fact that both α′ martensite and γ phase are dissolved in the above conditions. From the observation of stress corrosion morphologies and the change in weight loss with time, it has been found that correlation exists between susceptibility to stress corrosion and chemical stability of the protective layer on the steel.
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