Abstract
The influence of both strain-induced α′ martensite in Type 304 steel and NaBr concentration in a solution of 2 kmol/m3 H2SO4 at 368 K on stress corrosion characteristics, was examined. The results show that the α′ and NaBr concentration were major variables affecting the susceptibility to cracking. As the amount of α′ was increased or the NaBr concentration was reduced, the crack density increased and the time-to-fracture decreased gradually and either further increase in α′ or further decrease in NaBr concentration led to general corrosion. The attack tended to proceed along the stress-induced α′ martensite, which was anodically more active than the γ phase in the test solutions. Discussion covered the problem concerning the correlation between susceptibility to stress corrosion and the inhibiting action of bromide ions on the basis of the results of anodic polarization and weight loss measurements, and of the results of the above stress corrosion tests.
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