Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 628, Issue -, Pages 252-261Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.01.054
Keywords
Hydrogen embrittlement; Austenitic stainless steel; Cold forming; Williamson-Hall
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Funding
- German Stiftung Stahlanwendungsforschung im Stifterverband fur die Deutsche Wissenschaft e.V. [5932]
- German Bundesministerium fur Wirtschaft und Technologie [0327802A]
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Austenitic stainless steels with three different nickel contents were cold worked to various forming degrees at various temperatures to obtain a wide variety of cold worked microstructures. Dislocation density analyses using the Williamson-Hall method provide first indications that strain hardening using technically relevant cold forming parameters increases the susceptibility of austenitic stainless steels to hydrogen environment embrittlement mainly by creating a microstructure with a critical amount of dislocations. Although an effect of prior-existing martensite may not be totally excluded, this effect seems to be minor compared to the effect of dislocation substructure. Macroscopic residual stresses have no significant influence on the susceptibility of cold worked austenitic stainless steels to hydrogen environment embrittlement in tensile tests. (C) 2015 Elsevier B.V. All rights reserved.
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