Interstitial hydrogen diffusion in M7C3 (M = Cr, Mn, Fe),
(2023) In Computational Materials Science 218.- Abstract
- To increase the understanding of the role of carbide precipitates on the hydrogen embrittlement of martensiticsteels, we have performed a density functional theory study on the solution energies and energy barriers forhydrogen diffusion in orthorhombic M7C3 (M = Cr, Mn, Fe). Hydrogen can easily diffuse into the lattice andcause internal stresses or bond weakening, which may promote reduced ductility. Solution energies of hydrogenat different lattice positions have systematically been explored, and the lowest values are -0.28, 0.00, and 0.03eV/H-atom for Cr7C3, Mn7C3, and Fe7C3, respectively. Energy barriers for the diffusion of hydrogen atoms havebeen... (More)
- To increase the understanding of the role of carbide precipitates on the hydrogen embrittlement of martensiticsteels, we have performed a density functional theory study on the solution energies and energy barriers forhydrogen diffusion in orthorhombic M7C3 (M = Cr, Mn, Fe). Hydrogen can easily diffuse into the lattice andcause internal stresses or bond weakening, which may promote reduced ductility. Solution energies of hydrogenat different lattice positions have systematically been explored, and the lowest values are -0.28, 0.00, and 0.03eV/H-atom for Cr7C3, Mn7C3, and Fe7C3, respectively. Energy barriers for the diffusion of hydrogen atoms havebeen probed with the nudged elastic band method, which shows comparably low barriers for transport viainterstitial octahedral sites for all three systems. Analysis of the atomic volume reveals a correlation betweenlow solution energies and energy barriers and atoms with large atomic volumes. Furthermore, it shows that thepresence of carbon tends to increase the energy barrier. Our results can explain previous experimental findingsof hydrogen located in the bulk of Cr7C3 precipitates and provide a solid basis for future design efforts of steelswith high strength and commensurable ductility (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/7b3b2187-9434-4489-83df-1f636715c10e
- author
- Krause, Andreas ; Olsson, Pär LU ; Music, Denis and Bjerkén, Christina
- organization
- publishing date
- 2023-02-05
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Computational Materials Science
- volume
- 218
- article number
- 111940
- publisher
- Elsevier
- external identifiers
-
- scopus:85144276997
- ISSN
- 0927-0256
- DOI
- 10.1016/j.commatsci.2022.111940
- language
- English
- LU publication?
- yes
- id
- 7b3b2187-9434-4489-83df-1f636715c10e
- date added to LUP
- 2022-12-20 19:34:02
- date last changed
- 2023-01-18 04:05:15
@article{7b3b2187-9434-4489-83df-1f636715c10e, abstract = {{To increase the understanding of the role of carbide precipitates on the hydrogen embrittlement of martensiticsteels, we have performed a density functional theory study on the solution energies and energy barriers forhydrogen diffusion in orthorhombic M<sub>7</sub>C<sub>3</sub> (M = Cr, Mn, Fe). Hydrogen can easily diffuse into the lattice andcause internal stresses or bond weakening, which may promote reduced ductility. Solution energies of hydrogenat different lattice positions have systematically been explored, and the lowest values are -0.28, 0.00, and 0.03eV/H-atom for Cr<sub>7</sub>C<sub>3</sub>, Mn<sub>7</sub>C<sub>3</sub>, and Fe<sub>7</sub>C<sub>3</sub>, respectively. Energy barriers for the diffusion of hydrogen atoms havebeen probed with the nudged elastic band method, which shows comparably low barriers for transport viainterstitial octahedral sites for all three systems. Analysis of the atomic volume reveals a correlation betweenlow solution energies and energy barriers and atoms with large atomic volumes. Furthermore, it shows that thepresence of carbon tends to increase the energy barrier. Our results can explain previous experimental findingsof hydrogen located in the bulk of Cr<sub>7</sub>C<sub>3</sub> precipitates and provide a solid basis for future design efforts of steelswith high strength and commensurable ductility}}, author = {{Krause, Andreas and Olsson, Pär and Music, Denis and Bjerkén, Christina}}, issn = {{0927-0256}}, language = {{eng}}, month = {{02}}, publisher = {{Elsevier}}, series = {{Computational Materials Science}}, title = {{Interstitial hydrogen diffusion in M<sub>7</sub>C<sub>3</sub> (M = Cr, Mn, Fe),}}, url = {{https://lup.lub.lu.se/search/files/131964551/Krause_2023.pdf}}, doi = {{10.1016/j.commatsci.2022.111940}}, volume = {{218}}, year = {{2023}}, }