Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 28, Pages 8100-8105Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.07.031
Keywords
Austenitic stainless steel; Hydrogen; Grain boundaries; Dislocations; Precipitation; High-pressure torsion
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan
- NEDO
- Grants-in-Aid for Scientific Research [23760671, 23102507] Funding Source: KAKEN
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This study was conducted to clarify the effects of grain boundaries and precipitates on room-temperature hydrogen transport in two types of austenitic stainless steels with ultrafine-grained structures produced by high-pressure torsion (HPT) and subsequent annealing. The grains in the Fe-25Ni-15Cr (in mass%) alloy containing Ti and the Fe-25Cr-20Ni alloy were refined by the HPT-processing to similar to 150 and similar to 85nm, respectively. The high-temperature annealing after the HPT processing led to the precipitation of eta-Ni(3)Ti for the former and sigma-FeCr for the latter. In the HPT-processed specimens, hydrogen diffusivity was enhanced through short-circuit diffusion because of the increased population of grain boundaries in comparison with the increased opportunity of hydrogen trapping on dislocations. As for the post-HPT-annealed specimens having the precipitates, the hydrogen diffusion was hindered by the hydrogen trapping on eta-Ni(3)Ti precipitates, but was not affected by sigma-FeCr precipitation. This depends on the affinity between hydrogen and constituting elements. (C) 2011 Elsevier B.V. All rights reserved.
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