Affiliation:
1. Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, Russia
2. Department of Physical Materials Science, National University of Science and Technology MISiS, 119049 Moscow, Russia
Abstract
The influence of strain rate in the interval of (10−5–10−3) 1/s on room temperature tensile behavior, dislocation arrangement, deformation mechanisms, and fracture of austenitic stainless steel AISI 316L electrochemically charged with hydrogen was investigated. Independently on strain rate, hydrogen charging provides the increase in the yield strength of the specimens due to a solid solution hardening of austenite, but it slightly influences deformation behavior and strain hardening of the steel. Simultaneously, hydrogen charging assists surface embrittlement of the specimens during straining and reduces an elongation to failure, which both are strain rate-dependent parameters. Hydrogen embrittlement index decreases with increase in strain rate, which testifies the importance of hydrogen transport with dislocations during plastic deformation. The stress–relaxation tests directly confirm the hydrogen-enhanced increase in the dislocation dynamics at low strain rates. The interaction of the hydrogen atoms with dislocations and hydrogen-associated plastic flow are discussed.
Funder
Government research assignment for ISPMS SB RAS
Subject
General Materials Science
Cited by
3 articles.
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