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

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...

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Bibliographic Details
Main Authors: Lee, Dong-Hyun, Jung, Jae Yeong, Lee, Keun Hyung, Lee, Soo Yeol, Zhao, Yakai, Lau, Kwang Boon, Wang, Pei, Ramamurty, Upadrasta
Other Authors: School of Mechanical and Aerospace Engineering
Format: Journal Article
Language:English
Published: 2023
Subjects:
Engineering::Mechanical engineering
Engineering::Materials
Hydrogen Embrittlement
Laser-Powder Bed Fusion
Online Access:https://hdl.handle.net/10356/172870
Description
Summary: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.

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