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Christien, F. (2020) Role of Impurity Sulphur in the Ductility Trough of Austenitic Iron-Nickel Alloys. Materials, 13 539.
Added by: Richard Baschera (2020-04-24 10:26:41) Last edited by: Richard Baschera (2020-04-24 10:43:37) |
| Type de référence: Article DOI: 10.3390/ma13030539 Clé BibTeX: Christien2020 Voir tous les détails bibliographiques  |
Catégories: HORSIMN Mots-clés: ductility dip cracking, ductility trough, hot-shortness, intermediate temperature embrittlement, Nickel alloys, sulphur Créateurs: Christien Collection: Materials |
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Indice de consultation : 6% Indice de popularité : 1.5% |
| Liens URLs https://www.mdpi.com/1996-1944/13/3/539 |
| Résumé |
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The role of impurity sulphur in the ductility trough of iron–nickel (Fe–Ni) alloys is investigated using hot tensile tests. A strong detrimental effect of some ppm levels of sulphur is demonstrated. In addition, it is shown that, in the ductility trough, material failure occurs through subcritical grain boundary crack propagation, involving dynamic embrittlement at the crack tip, due to the sulphur. Very high intergranular crack growth rates are observed. This is possible because plastic deformation accelerates the transport of sulphur to the crack tip, by several orders of magnitude, compared to normal bulk diffusion. The ductility is recovered at high strain rates, which correlates with a decrease in the sulphur concentration measured on the fracture surface. It is suggested that the main mechanism of sulphur transport is dragging by moving dislocations.
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