Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 651, Issue -, Pages 935-944Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.11.017
Keywords
Twinning induced plasticity (TWIP) steel; Grain refinement; Tensile property; Hydrogen embrittlement; Grain boundary
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Funding
- Elements Strategy Initiative for Structural Materials (ESISM) through the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [2201]
- Japanese Government Scholarship
- Grants-in-Aid for Scientific Research [22102001, 15H05767, 14J02927] Funding Source: KAKEN
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Hydrogen embrittlement behaviors of a high-Mn TWIP (twinning induced plasticity) steel with various grain sizes from coarse grains to ultra-fine grains were studied by hydrogen pre-charging and subsequent slow stain rate tensile tests. The results of the tensile tests showed that the yield strength and tensile strength were not influenced by hydrogen-charging, whereas the total elongation reduced with hydrogen-charging in coarse-grained specimen but no change in the ultrafine-grained specimen. Fracture surfaces showed dimple patterns in all specimens. The present results suggested that the grain refinement suppressed hydrogen embrittlement in the high-Mn TWIP steel, even though the diffusible hydrogen content increased by grain refinement. (c) 2015 Elsevier B.V. All rights reserved.
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