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Zuev, L.
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Effect of Hydrogen on Plastic Strain Localization in Single Crystals of Nickel and Austenitic Stainless Steel
Abstract
Tensile tests accompanied with on-line in situ FEG-SEM observations are performed to study hydrogen effects on plastic strain localization in the form of slip lines in single crystals of nickel and AISI 316L austenitic stainless steel. Flat tensile test specimens are pre-charged potentiostatically with hydrogen at conditions not forming hydride or other hydrogen-induced phases. It is found that slip lines on the hydrogen-charged AISI 316L stainless steel specimens are markedly shorter in length than those on the hydrogen-free surfaces. Positron annihilation spectroscopy is applied to study the mutual effect of hydrogen and plastic deformation on excessive generation of vacancies and vacancy complexes in the studied single crystals. In hydrogen-charged AISI 316L stainless steel pre-strain to about 15 % in tension results in vacancy clusters and probably hydrogen filled microvoids. No vacancy complexes were detected in hydrogen-charged nickel deformed to about 7 %. The obtained results are analyzed and discussed in terms of the hydrogen enhanced localized plasticity (HELP) mechanism with special attention to the effect of hydrogen on the non-conservative dislocation-dislocation interactions.