AI Article Synopsis
- The study examined how interstitial hydrogen affects the elastic properties of bcc Fe, bcc Fe-Cr, and bcc Fe-Ni using advanced density functional theory calculations.
- Results showed that as hydrogen concentration increases, the elastic moduli of these materials decrease linearly.
- Additionally, the analysis revealed that bcc Fe-Cr has fewer dislocation pile-ups and shorter critical crack growth lengths compared to bcc Fe and bcc Fe-Ni, making it more susceptible to crack formation due to hydrogen embrittlement; the study suggests a mechanism to explain the differing effects of chromium and nickel on this phenomenon.
Article Abstract
The effect of interstitial hydrogen on the elastic properties of bcc Fe, bcc Fe-Cr, and bcc Fe-Ni was investigated using density functional theory calculations. Our results indicate that the elastic moduli decrease linearly with increasing hydrogen concentration. The consequences of hydrogen for the mechanical properties of bcc Fe, bcc Fe-Cr, and bcc Fe-Ni were analyzed, considering various factors such as the ideal shear stress, Peierls stress, number of dislocation pile-ups, and critical crack growth lengths. At the same hydrogen concentration, compared to the bcc Fe and bcc Fe-Ni systems, fewer dislocation pile-ups and shorter critical crack growth lengths can facilitate the nucleation and propagation of cracks in the bcc Fe-Cr system. Finally, we propose a mechanism to explain the influence of Cr and Ni on hydrogen embrittlement.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11392939 | PMC |
| http://dx.doi.org/10.1038/s41598-024-71903-4 | DOI Listing |
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