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Tancret, F., Laigo, J., Christien, F., Le Gall, R. & Furtado, J. (2018) Phase transformations in Fe-Ni-Cr heat-resistant alloys for reformer tube applications. Materials Science and Technology, 34 1333–1343.
Added by: Richard Baschera (2018-08-23 08:07:56) Last edited by: Richard Baschera (2018-08-23 08:12:24) |
| Type de référence: Article DOI: 10.1080/02670836.2018.1449177 Clé BibTeX: Tancret2018 Voir tous les détails bibliographiques  |
Catégories: ID2M Créateurs: Christien, Furtado, Laigo, Le Gall, Tancret Collection: Materials Science and Technology |
Consultations : 1/536
Indice de consultation : 5% Indice de popularité : 1.25% |
| Résumé |
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Fe-35Ni-25Cr-0.4C alloys with different compositions are aged between 750 and 1150 degrees C up to similar to 10,000h. As-cast microstructure contains interdendritic carbides of type M7C3 ('Cr7C3') and MC ('NbC'). At service temperatures, M7C3 transform into M23C6 ('Cr23C6') within hours. Then, a hardening precipitation of secondary intragranular M23C6 occurs over hundreds of hours, the nose of the 'temperature-time-hardening' curve being around 1000 degrees C. G phase forms after long aging; its solvus temperature and formation kinetics depend on silicon content. Z phase is observed after long aging at 950 degrees C or above. G and Z phases form at the expense of MC. Very long aging causes nitridation under air, with first a transformation of M23C6 into chromium-rich M2X carbonitrides (X = C,N), then of MC into chromium-rich MX carbonitrides.
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