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Stress Corrosion Cracking and Hydrogen Embrittlement of Alloy EP-823


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Год выпуска: 2010
Автор: Mohammad Hossain
Издательство: LAP Lambert Academic Publishing
Страниц: 200
ISBN: 9783838360164
Описание
 This investigation is focused on the evaluation of stress corrosion cracking (SCC), localized corrosion, and hydrogen embrittlement (HE) susceptibility of martensitic Alloy EP-823 in neutral and acidic solutions at ambient and elevated temperatures. While no failures were observed in smooth specimens in the neutral solution, failures were noticed in the 90°C acidic solution at constant-load (CL) leading to a threshold stress (?th) of 102 ksi. The presence of a notch reduced the ?th value to 91 ksi in a similar environment. The ductility (%El and %RA), time-to-failure (TTF), and true failure stress (?f) were gradually reduced in both environments with increasing temperature during SSR testing. The presence of a notch, however, enhanced the ?f value. All polarized specimens exhibited localized attack. The application of a controlled cathodic potential further reduced the ductility, TTF and of showing the characteristics of more brittle failures. Metallographic and fractographic...

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