[article]
| Titre : |
Conversion of MX nitrides to Z-phase in a martensitic 12% Cr steel |
| Type de document : |
texte imprimé |
| Auteurs : |
Leonardo Cipolla, Auteur ; Hilmar K. Danielsen, Auteur ; Dario Venditti, Auteur |
| Article en page(s) : |
pp. 669-679 |
| Note générale : |
Métallurgie |
| Langues : |
Anglais (eng) |
| Mots-clés : |
TEM XRD Heat resistant steels Nitrides Phase transformation kinetics |
| Index. décimale : |
669 Métallurgie |
| Résumé : |
A 12% Cr model steel was designed with the purpose of studying the nucleation and growth of modified Z-phase, Cr(V,Nb)N.
The model alloy develops Z-phase after relatively short ageing times and contains only nitrides of Cr, V and Nb.
Interferences from the presence of carbides and the development of Laves phase were avoided by keeping the C, W and Mo contents as low as possible.
Transmission electron microscopy and X-ray diffraction analysis of extracted particles were used to follow the evolutions of phase composition, phase morphology and phase fraction, particularly of the precipitation of Z-phase, during ageing at 600, 650 and 700°C for up to 103 h.
The development of Z-phase appears to be accomplished by the diffusion of Cr atoms into (V,Nb)N particles and their subsequent conversion into cubic or tetragonal Z-phase.
Studies at various temperatures indicate that Z-phase development proceeds fastest at 650°C and that Z-phase forms faster at prior austenite grain boundaries. |
| DEWEY : |
669 |
| ISSN : |
1359-6454 |
| En ligne : |
http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...] |
in Acta materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 669-679
[article] Conversion of MX nitrides to Z-phase in a martensitic 12% Cr steel [texte imprimé] / Leonardo Cipolla, Auteur ; Hilmar K. Danielsen, Auteur ; Dario Venditti, Auteur . - pp. 669-679. Métallurgie Langues : Anglais ( eng) in Acta materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 669-679
| Mots-clés : |
TEM XRD Heat resistant steels Nitrides Phase transformation kinetics |
| Index. décimale : |
669 Métallurgie |
| Résumé : |
A 12% Cr model steel was designed with the purpose of studying the nucleation and growth of modified Z-phase, Cr(V,Nb)N.
The model alloy develops Z-phase after relatively short ageing times and contains only nitrides of Cr, V and Nb.
Interferences from the presence of carbides and the development of Laves phase were avoided by keeping the C, W and Mo contents as low as possible.
Transmission electron microscopy and X-ray diffraction analysis of extracted particles were used to follow the evolutions of phase composition, phase morphology and phase fraction, particularly of the precipitation of Z-phase, during ageing at 600, 650 and 700°C for up to 103 h.
The development of Z-phase appears to be accomplished by the diffusion of Cr atoms into (V,Nb)N particles and their subsequent conversion into cubic or tetragonal Z-phase.
Studies at various temperatures indicate that Z-phase development proceeds fastest at 650°C and that Z-phase forms faster at prior austenite grain boundaries. |
| DEWEY : |
669 |
| ISSN : |
1359-6454 |
| En ligne : |
http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...] |
|
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