Effect of Cu on the evolution of precipitation in an Fe–Cr–Ni–Al–Ti maraging steel / Ronald Schnitzer in Acta materialia, Vol. 58 N° 10 (Juin 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3733–3741 Titre : Effect of Cu on the evolution of precipitation in an Fe–Cr–Ni–Al–Ti maraging steel Type de document : texte imprimé Auteurs : Ronald Schnitzer, Auteur ; Michael Schober, Auteur ; Silvia Zinner, Auteur Année de publication : 2011 Article en page(s) : pp. 3733–3741 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Maraging steel Atom probe tomography Precipitates Aging Résumé : The evolution of precipitates in an Fe–Cr–Ni–Al–Ti stainless maraging steel alloyed with Cu was investigated during aging at 525 °C. Atom probe tomography was used to reveal the development of precipitates and to determine their chemical composition. Two types of precipitates were observed to form during the aging process. Based on their chemical composition these are assumed to be NiAl B2 and Ni3(Ti,Al) (η-phase). The two phases of precipitates were found to develop independently of each other and the addition of Cu was found to accelerate precipitation. However, the effect of Cu on the nucleation of these phases is different: on the one hand, in the case of NiAl, Cu is incorporated and thus reduces the activation energy by reducing the lattice misfit; on the other hand, Cu acts as a nucleation site for the precipitation of Ni3(Ti,Al) by forming independent Cu clusters. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001552 [article] Effect of Cu on the evolution of precipitation in an Fe–Cr–Ni–Al–Ti maraging steel [texte imprimé] / Ronald Schnitzer, Auteur ; Michael Schober, Auteur ; Silvia Zinner, Auteur . - 2011 . - pp. 3733–3741. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3733–3741 Mots-clés : Maraging steel Atom probe tomography Precipitates Aging Résumé : The evolution of precipitates in an Fe–Cr–Ni–Al–Ti stainless maraging steel alloyed with Cu was investigated during aging at 525 °C. Atom probe tomography was used to reveal the development of precipitates and to determine their chemical composition. Two types of precipitates were observed to form during the aging process. Based on their chemical composition these are assumed to be NiAl B2 and Ni3(Ti,Al) (η-phase). The two phases of precipitates were found to develop independently of each other and the addition of Cu was found to accelerate precipitation. However, the effect of Cu on the nucleation of these phases is different: on the one hand, in the case of NiAl, Cu is incorporated and thus reduces the activation energy by reducing the lattice misfit; on the other hand, Cu acts as a nucleation site for the precipitation of Ni3(Ti,Al) by forming independent Cu clusters. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001552

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