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Investigations on Stress corrosion cracking of sensitized austenitic stainless steels and nickel‐base alloys in boiling aqueous solutions by potentiostatically controlled constant‐load experiments
Author(s) -
Herbsleb Günter
Publication year - 1979
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19790101107
Subject(s) - intergranular corrosion , incoloy , metallurgy , materials science , stress corrosion cracking , boiling , alloy , austenitic stainless steel , sulfuric acid , aqueous solution , austenite , corrosion , chemistry , microstructure , organic chemistry
The susceptibility of high alloyed materials to intergranular SCC is markedly influenced not only by material and environmental parameters, but also by the potential. The present paper describes in detail the influence of the potential on the susceptibility to intergranular SCC of these materials in aqueous solutions boiling under normal pressure by means of potentiostatically controlled constant load experiments. The following parameters have been varied:I Material (i) alloy composition: 18/10 non‐stabilized stainless steel; Incoloy 800; Inconel 600; (ii) degree of sensitization; (iii) pre‐damage by intergranular attack, caused in sulfuric acid/copper sulphate‐solution; (iv) level of mechanical stresses.II Environment (i) sodium chloride concentration; (ii) sodium sulphate concentration; (iii) pH (buffer solutions of pH 2.2 and 4.5).III PotentialThe test‐duration was up to several thousand hours. The type of attack – intergranular corrosion, intergranular and/or transgranular cracking – has been established by metallografic investigations. The experimental results are presented in form of time‐to‐failure/potential curves with the above mentioned parameters. Conclusions for the in‐service behaviour of the materials investigated are derived.