Details
| Original language | English |
|---|---|
| Article number | 113642 |
| Journal | Scripta materialia |
| Volume | 194 |
| Early online date | 27 Nov 2020 |
| Publication status | Published - 15 Mar 2021 |
Abstract
In the present study, the effect of nitrogen alloying on hydrogen embrittlement in FeMnNiCoCr high-entropy alloys was investigated. In tension, hydrogen-free nitrogen-alloyed FeMnNiCoCrN alloy (0.37 wt.% N) demonstrated higher strength, strain hardening, and elongation-to-failure than the interstitial-free FeMnNiCoCr Cantor alloy. Despite the different tensile properties, both alloys fractured via a ductile dimple micromechanism. After hydrogen charging, the nitrogen-alloyed material demonstrated lower strain hardening and higher sensitivity to hydrogen-assisted embrittlement than the interstitial-free alloy. Both alloys featured a stable austenitic structure and similar grain size, yet, the nitrogen-alloyed FeMnNiCoCr alloy was more susceptible to hydrogen embrittlement. Although, the overall degradation effects appear similar, there are pronounced differences in mechanical behavior and hydrogen transport upon hydrogen charging when the high-entropy alloys are compared to conventional austenitic stainless steels, and the experiments reveales that nitrogen alloying enhances hydrogen diffusivity in the Cantor alloy.
Keywords
- Austenite, Fracture, High entropy alloy, Hydrogen embrittlement, Interstitials
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Materials Science(all)
- Metals and Alloys
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Scripta materialia, Vol. 194, 113642, 15.03.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The effect of nitrogen alloying on hydrogen-assisted plastic deformation and fracture in FeMnNiCoCr high-entropy alloys
AU - Astafurova, E. G.
AU - Panchenko, M. Yu
AU - Reunova, K. A.
AU - Mikhno, A. S.
AU - Moskvina, V. A.
AU - Melnikov, E. V.
AU - Astafurov, S. V.
AU - Maier, H. J.
N1 - Funding Information: This study was supported by the Russian Science Foundation (project No. 20-19-00261) (E.G. Astafurova: Conceptualization, Supervision, Writing - original draft; M.Yu. Panchenko, K.A. Reunova, A.S. Mikhno, V.A. Moskvina, E.V. Melnikov, S.V. Astafurov: Methodology, Investigation, Visualization, Data curation, Formal analysis, Writing - review & editing). The studies were conducted using the equipment of the Institute of Strength Physics and Materials Science (NANOTECH center). H.J. Maier acknowledges financial support by the German Research Foundation (project number 388671975) (Review & editing of the manuscript).
PY - 2021/3/15
Y1 - 2021/3/15
N2 - In the present study, the effect of nitrogen alloying on hydrogen embrittlement in FeMnNiCoCr high-entropy alloys was investigated. In tension, hydrogen-free nitrogen-alloyed FeMnNiCoCrN alloy (0.37 wt.% N) demonstrated higher strength, strain hardening, and elongation-to-failure than the interstitial-free FeMnNiCoCr Cantor alloy. Despite the different tensile properties, both alloys fractured via a ductile dimple micromechanism. After hydrogen charging, the nitrogen-alloyed material demonstrated lower strain hardening and higher sensitivity to hydrogen-assisted embrittlement than the interstitial-free alloy. Both alloys featured a stable austenitic structure and similar grain size, yet, the nitrogen-alloyed FeMnNiCoCr alloy was more susceptible to hydrogen embrittlement. Although, the overall degradation effects appear similar, there are pronounced differences in mechanical behavior and hydrogen transport upon hydrogen charging when the high-entropy alloys are compared to conventional austenitic stainless steels, and the experiments reveales that nitrogen alloying enhances hydrogen diffusivity in the Cantor alloy.
AB - In the present study, the effect of nitrogen alloying on hydrogen embrittlement in FeMnNiCoCr high-entropy alloys was investigated. In tension, hydrogen-free nitrogen-alloyed FeMnNiCoCrN alloy (0.37 wt.% N) demonstrated higher strength, strain hardening, and elongation-to-failure than the interstitial-free FeMnNiCoCr Cantor alloy. Despite the different tensile properties, both alloys fractured via a ductile dimple micromechanism. After hydrogen charging, the nitrogen-alloyed material demonstrated lower strain hardening and higher sensitivity to hydrogen-assisted embrittlement than the interstitial-free alloy. Both alloys featured a stable austenitic structure and similar grain size, yet, the nitrogen-alloyed FeMnNiCoCr alloy was more susceptible to hydrogen embrittlement. Although, the overall degradation effects appear similar, there are pronounced differences in mechanical behavior and hydrogen transport upon hydrogen charging when the high-entropy alloys are compared to conventional austenitic stainless steels, and the experiments reveales that nitrogen alloying enhances hydrogen diffusivity in the Cantor alloy.
KW - Austenite
KW - Fracture
KW - High entropy alloy
KW - Hydrogen embrittlement
KW - Interstitials
UR - http://www.scopus.com/inward/record.url?scp=85096828242&partnerID=8YFLogxK
U2 - 10.1016/j.scriptamat.2020.113642
DO - 10.1016/j.scriptamat.2020.113642
M3 - Article
AN - SCOPUS:85096828242
VL - 194
JO - Scripta materialia
JF - Scripta materialia
SN - 1359-6462
M1 - 113642
ER -