Distinct effects of in-situ and ex-situ hydrogen charging methods on the mechanical behavior of CoCrFeNi high-entropy alloy fabricated by laser-powder bed fusion
The hydrogen embrittlement behavior of CoCrFeNi high-entropy alloy (HEA) fabricated by laser-powder bed fusion (L-PBF) under ex-situ and in-situ hydrogen charging conditions was investigated. The ex-situ hydrogen pre-charged sample showed excellent resistance to hydrogen embrittlement, whereas in-si...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Online Access: | https://hdl.handle.net/10356/172870 |
| _version_ | 1811684971841060864 |
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| author | Lee, Dong-Hyun Jung, Jae Yeong Lee, Keun Hyung Lee, Soo Yeol Zhao, Yakai Lau, Kwang Boon Wang, Pei Ramamurty, Upadrasta |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Lee, Dong-Hyun Jung, Jae Yeong Lee, Keun Hyung Lee, Soo Yeol Zhao, Yakai Lau, Kwang Boon Wang, Pei Ramamurty, Upadrasta |
| author_sort | Lee, Dong-Hyun |
| collection | NTU |
| description | The hydrogen embrittlement behavior of CoCrFeNi high-entropy alloy (HEA) fabricated by laser-powder bed fusion (L-PBF) under ex-situ and in-situ hydrogen charging conditions was investigated. The ex-situ hydrogen pre-charged sample showed excellent resistance to hydrogen embrittlement, whereas in-situ hydrogen charging during tensile testing led to a substantial loss in ductility and prevailing hydrogen-assisted cracking. Such discrepancy was attributed to the enhanced apparent solubility and diffusivity especially at grain boundaries in the in-situ condition. The underlying hydrogen embrittlement mechanisms for the current L-PBF HEA are discussed, through which the critical role of the synergy between mechanical and environmental conditions is highlighted. |
| first_indexed | 2024-10-01T04:37:07Z |
| format | Journal Article |
| id | ntu-10356/172870 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:37:07Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1728702023-12-27T04:54:46Z Distinct effects of in-situ and ex-situ hydrogen charging methods on the mechanical behavior of CoCrFeNi high-entropy alloy fabricated by laser-powder bed fusion Lee, Dong-Hyun Jung, Jae Yeong Lee, Keun Hyung Lee, Soo Yeol Zhao, Yakai Lau, Kwang Boon Wang, Pei Ramamurty, Upadrasta School of Mechanical and Aerospace Engineering A*STAR Institute of Material Research and Engineering Engineering::Mechanical engineering Engineering::Materials Hydrogen Embrittlement Laser-Powder Bed Fusion The hydrogen embrittlement behavior of CoCrFeNi high-entropy alloy (HEA) fabricated by laser-powder bed fusion (L-PBF) under ex-situ and in-situ hydrogen charging conditions was investigated. The ex-situ hydrogen pre-charged sample showed excellent resistance to hydrogen embrittlement, whereas in-situ hydrogen charging during tensile testing led to a substantial loss in ductility and prevailing hydrogen-assisted cracking. Such discrepancy was attributed to the enhanced apparent solubility and diffusivity especially at grain boundaries in the in-situ condition. The underlying hydrogen embrittlement mechanisms for the current L-PBF HEA are discussed, through which the critical role of the synergy between mechanical and environmental conditions is highlighted. Agency for Science, Technology and Research (A*STAR) The work at Chungnam National University was supported in part by research fund of Chungnam National University, and in part by the National Research Foundation (NRF) grant funded by the Korean government (MSIT) (No. 2021R1A4A1031494 and No. 2021R1F1A1048393). The work at Nanyang Technological University and Institute of Materials Research and Engineering was supported by Agency for Science, Technology and Research (A*STAR) of Singapore via the Structural Metal Alloys Programme (No. A18B1b0061). 2023-12-27T04:54:46Z 2023-12-27T04:54:46Z 2023 Journal Article Lee, D., Jung, J. Y., Lee, K. H., Lee, S. Y., Zhao, Y., Lau, K. B., Wang, P. & Ramamurty, U. (2023). Distinct effects of in-situ and ex-situ hydrogen charging methods on the mechanical behavior of CoCrFeNi high-entropy alloy fabricated by laser-powder bed fusion. Journal of Alloys and Compounds, 940, 168858-. https://dx.doi.org/10.1016/j.jallcom.2023.168858 0925-8388 https://hdl.handle.net/10356/172870 10.1016/j.jallcom.2023.168858 2-s2.0-85146443689 940 168858 en A18B1b0061 Journal of Alloys and Compounds © 2023 Elsevier B.V. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Engineering::Materials Hydrogen Embrittlement Laser-Powder Bed Fusion Lee, Dong-Hyun Jung, Jae Yeong Lee, Keun Hyung Lee, Soo Yeol Zhao, Yakai Lau, Kwang Boon Wang, Pei Ramamurty, Upadrasta Distinct effects of in-situ and ex-situ hydrogen charging methods on the mechanical behavior of CoCrFeNi high-entropy alloy fabricated by laser-powder bed fusion |
| title | Distinct effects of in-situ and ex-situ hydrogen charging methods on the mechanical behavior of CoCrFeNi high-entropy alloy fabricated by laser-powder bed fusion |
| title_full | Distinct effects of in-situ and ex-situ hydrogen charging methods on the mechanical behavior of CoCrFeNi high-entropy alloy fabricated by laser-powder bed fusion |
| title_fullStr | Distinct effects of in-situ and ex-situ hydrogen charging methods on the mechanical behavior of CoCrFeNi high-entropy alloy fabricated by laser-powder bed fusion |
| title_full_unstemmed | Distinct effects of in-situ and ex-situ hydrogen charging methods on the mechanical behavior of CoCrFeNi high-entropy alloy fabricated by laser-powder bed fusion |
| title_short | Distinct effects of in-situ and ex-situ hydrogen charging methods on the mechanical behavior of CoCrFeNi high-entropy alloy fabricated by laser-powder bed fusion |
| title_sort | distinct effects of in situ and ex situ hydrogen charging methods on the mechanical behavior of cocrfeni high entropy alloy fabricated by laser powder bed fusion |
| topic | Engineering::Mechanical engineering Engineering::Materials Hydrogen Embrittlement Laser-Powder Bed Fusion |
| url | https://hdl.handle.net/10356/172870 |
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