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Effect of microalloying on precipitate evolution in ferritic welds and implications for toughness / Badri K. Narayanan in Acta materialia, Vol. 58 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 781-791 Titre : Effect of microalloying on precipitate evolution in ferritic welds and implications for toughness Type de document : texte imprimé Auteurs : Badri K. Narayanan, Auteur ; L. Kovarik, Auteur ; Peter M. Sarosi, Auteur Article en page(s) : pp. 781-791 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Welding  Precipitation  STEM  Toughness  Ferritic  steels Index. décimale : 669 Métallurgie Résumé : Ferritic weld metal deposited with a self-shielded arc-welding process has intentional additions of aluminum, magnesium, titanium and zirconium. This results in a complex precipitation process that has been characterized with a combination of electron microscopy techniques. This work indicates that the formation of a spinel oxide is critical for the nucleation of nitrides of zirconium and titanium and prevents the agglomeration of aluminum rich oxides and the formation of large aluminum nitrides. High-resolution transmission electron microscopy has been used to characterize the core/shell structure of the precipitates with microalloying additions. Thermodynamic modeling of the precipitate formation during solidification is consistent with the microstructural observations. The evolution of precipitate formation is critical to limit large inclusions and improve weld metal toughness. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...] [article] Effect of microalloying on precipitate evolution in ferritic welds and implications for toughness [texte imprimé] / Badri K. Narayanan, Auteur ; L. Kovarik, Auteur ; Peter M. Sarosi, Auteur . - pp. 781-791. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 781-791 Mots-clés : Welding  Precipitation  STEM  Toughness  Ferritic  steels Index. décimale : 669 Métallurgie Résumé : Ferritic weld metal deposited with a self-shielded arc-welding process has intentional additions of aluminum, magnesium, titanium and zirconium. This results in a complex precipitation process that has been characterized with a combination of electron microscopy techniques. This work indicates that the formation of a spinel oxide is critical for the nucleation of nitrides of zirconium and titanium and prevents the agglomeration of aluminum rich oxides and the formation of large aluminum nitrides. High-resolution transmission electron microscopy has been used to characterize the core/shell structure of the precipitates with microalloying additions. Thermodynamic modeling of the precipitate formation during solidification is consistent with the microstructural observations. The evolution of precipitate formation is critical to limit large inclusions and improve weld metal toughness. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...]

Effect of microalloying on precipitate evolution in ferritic welds and implications for toughness / Badri K. Narayanan in Acta materialia, Vol. 58 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 781–791 Titre : Effect of microalloying on precipitate evolution in ferritic welds and implications for toughness Type de document : texte imprimé Auteurs : Badri K. Narayanan, Auteur ; L. Kovarik, Auteur ; Peter M. Sarosi, Auteur Année de publication : 2011 Article en page(s) : pp. 781–791 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Welding  Precipitation  STEM  Toughness  Ferritic  steels Résumé : Ferritic weld metal deposited with a self-shielded arc-welding process has intentional additions of aluminum, magnesium, titanium and zirconium. This results in a complex precipitation process that has been characterized with a combination of electron microscopy techniques. This work indicates that the formation of a spinel oxide is critical for the nucleation of nitrides of zirconium and titanium and prevents the agglomeration of aluminum rich oxides and the formation of large aluminum nitrides. High-resolution transmission electron microscopy has been used to characterize the core/shell structure of the precipitates with microalloying additions. Thermodynamic modeling of the precipitate formation during solidification is consistent with the microstructural observations. The evolution of precipitate formation is critical to limit large inclusions and improve weld metal toughness. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409006624 [article] Effect of microalloying on precipitate evolution in ferritic welds and implications for toughness [texte imprimé] / Badri K. Narayanan, Auteur ; L. Kovarik, Auteur ; Peter M. Sarosi, Auteur . - 2011 . - pp. 781–791. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 781–791 Mots-clés : Welding  Precipitation  STEM  Toughness  Ferritic  steels Résumé : Ferritic weld metal deposited with a self-shielded arc-welding process has intentional additions of aluminum, magnesium, titanium and zirconium. This results in a complex precipitation process that has been characterized with a combination of electron microscopy techniques. This work indicates that the formation of a spinel oxide is critical for the nucleation of nitrides of zirconium and titanium and prevents the agglomeration of aluminum rich oxides and the formation of large aluminum nitrides. High-resolution transmission electron microscopy has been used to characterize the core/shell structure of the precipitates with microalloying additions. Thermodynamic modeling of the precipitate formation during solidification is consistent with the microstructural observations. The evolution of precipitate formation is critical to limit large inclusions and improve weld metal toughness. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409006624