Elastic and plastic strains and the stress corrosion cracking of austenitic stainless steels. Progress report, April 30, 1977--December 30, 1977 Page: 4 of 45
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A newly developed test environment based on NaCl,
Na2SO4 and HC1 has provided some insight to several as-
pects of SCC in a transformable austenitic stainless
steel. Current vs. time curves indicated the presence
of the formation of a "protective" film which drastically
reduced the anodic current leading to failure. This
film, not indicated by the polarization curves, is sub-
ject to highly localized damage such as pitting. Thus,
although it allows only very small corrosion currents,
it is not truly protective. Hence, it is pseudo-passive.
The critical cracking potential did not exhibit any
difference between the annealed and the maximum (25%) de-
formation examined. The corrosion or open circuit poten-
tial for both annealed and deformed material behaved in a
similar manner, becoming more noble with time until it
reached the critical cracking potential and SCC ensured.
The failure time for the deformed specimens was substan-
tially shorter than for the annealed ones, but the incuba-
tion time was essentially the same.
Within the range of experimental conditions examined
thus far, it appears that the critical parameters leading
to SCC in a chloride environment are primarily dependent
on surface-environment interactions and not dependent on
the bulk properties.
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Troiano, A.R. Elastic and plastic strains and the stress corrosion cracking of austenitic stainless steels. Progress report, April 30, 1977--December 30, 1977, report, January 1, 1978; United States. (https://digital.library.unt.edu/ark:/67531/metadc1055522/m1/4/: accessed April 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.