Comparative study on mechanism of hydrogen embrittlement of Fe–18Mn-0.6C twinning-induced plasticity (TWIP) steel subjected to friction-stir welding (FSW) and tungsten inert-gas (TIG) welding
- Authors
- Kwon, Kyo-Min; Kim, Hye-Jin; Fujii, Hidetoshi; Kim, Jin-Seob; Kim, Jin-Kyung; Choi, Jeong-Won; Lee, Seung-Joon
- Issue Date
- Sep-2024
- Publisher
- Elsevier Ltd
- Keywords
- Fe-high Mn steels; Friction-stir welding (FSW); Hydrogen (H) embrittlement; Tungsten inert-gas (TIG) welding; Twinning-induced plasticity (TWIP)
- Citation
- Materials Science and Engineering: A, v.910, pp 1 - 20
- Pages
- 20
- Indexed
- SCIE
SCOPUS
- Journal Title
- Materials Science and Engineering: A
- Volume
- 910
- Start Page
- 1
- End Page
- 20
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/119850
- DOI
- 10.1016/j.msea.2024.146836
- ISSN
- 0921-5093
1873-4936
- Abstract
- In present study, we investigated the effect of welding technique on resistance of hydrogen (H) embrittlement in Fe–18Mn-0.6C (wt.%) twinning-induced plasticity (TWIP) steel by using an electrochemical H-charging, thermal desorption spectroscope, and electron microscope. The friction-stir welding (FSW) specimen was less sensitive to H embrittlement relative to base metal and tungsten inert-gas (TIG) welding specimens by differences in microstructure and deformation mechanism. During H-charging of the FSW specimen, numerous dislocations/Σ3 boundaries reduced H diffusion into specimen interior, causing shallowest depth of brittle fracture. In contrast, the depth of brittle fracture in the H-charged TIG specimen was much larger due to rapid H diffusion by decreased grain boundaries including Σ3 annealing twin boundaries. During tensile deformation, the H-charged FSW specimen underwent the reduction in stress concentration by inactive TWIP as well as strong resistance of boundary decohesion. It was because of alleviation of H-enhanced localized plasticity (HELP) mechanism, leading to suppression of H-induced crack growth. Conversely, the H-charged base metal and TIG specimens revealed large stress concentration by active TWIP and weak boundaries owing to strong effects of HELP + H-enhanced decohesion (HEDE) mechanisms, exhibiting rapid H-induced crack propagation. © 2024 Elsevier B.V.
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