Journal
SCRIPTA MATERIALIA
Volume 190, Issue -, Pages 108-112Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.08.047
Keywords
Austenitic steels; Twinning; Dislocations; Hydrogen embrittlement
Categories
Funding
- National Key R&D Program of China [2016YFB0700505]
- National Natural Science Foundation of China [51571028]
- 111 Project [B170003]
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The presence of hydrogen was found to decrease twin thickness and increase twin density in TWIP austenitic steel, influencing its hydrogen embrittlement behavior. This phenomenon, termed hydrogen-enhanced densified twinning, plays an important role in the twinning process of TWIP austenitic steel.
The effect of hydrogen on the twinning evolution in a twinning-induced plasticity (TWIP) austenitic steel was investigated at different strain levels. The presence of hydrogen decreased the twin thickness and increased the twin density in individual twin bundles, in comparison with the hydrogen-free condition. This mechanism, reported for the first time, was termed hydrogen-enhanced densified twinning (HEDT). Based on these experimental observations, the effect of hydrogen on twinning was analyzed from the three stages of nucleation, growth and stability. HEDT may elevate the local stress, and thus significantly affect the hydrogen embrittlement (HE) of TWIP steels. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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