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The appearance of a minimum in the susceptibility to stress corrosion cracking (SCC)/strain-rate curves obtained by slow strain-rate experiments has been examined carefully and a relationship between the repassivation rate of the material under investigation and the position of this minimum has been established.
For aluminum alloys, the results of the slow strain-rate experiments are not in complete agreement with the results of the conventional testing techniques. To explain this behavior, further experiments have to be carried out. At this moment, it seems to be doubtful whether the slow strain-rate testing technique is applicable to aluminum alloys.
The results with titanium alloys and high alloyed chromium- and chromium-nickel stainless steels obtained with different testing techniques (slow strain rate and constant load) are in very good agreement with each other.
stress corrosion cracking, tests, passivity
Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt E. V., Institut für Werkstoff-Forschung, Köln,