Genetic design and characterization of novel ultra-high-strength stainless steels strengthened by Ni3Ti intermetallic nanoprecipitates / W. Xu in Acta materialia, Vol. 58 N° 10 (Juin 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3582–3593 Titre : Genetic design and characterization of novel ultra-high-strength stainless steels strengthened by Ni3Ti intermetallic nanoprecipitates Type de document : texte imprimé Auteurs : W. Xu, Auteur ; P.E.J. Rivera-Díaz-del-Castillo, Auteur ; Wang, W., Auteur Année de publication : 2011 Article en page(s) : pp. 3582–3593 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Maraging steels Stainless Thermodynamics Precipitation Alloy design Résumé : A general computational alloy design approach based on thermodynamic and physical metallurgical principles, and coupled with a genetic optimization scheme, is presented. The method is applied to the design of new ultra-high-strength maraging stainless steels strengthened by Ni3Ti intermetallics. In the first design round, the alloy composition is optimized on the basis of precipitate formation at a fixed ageing temperature without considering other steps in the heat treatment. In the second round, the alloy is redesigned, applying an integrated model which allows for the simultaneous optimization of alloy composition and the ageing temperature as well as the prior austenitization temperature. The experimental characterizations of prototype alloys clearly demonstrate that alloys designed by the proposed approach achieve the desired microstructures. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S135964541000114X [article] Genetic design and characterization of novel ultra-high-strength stainless steels strengthened by Ni3Ti intermetallic nanoprecipitates [texte imprimé] / W. Xu, Auteur ; P.E.J. Rivera-Díaz-del-Castillo, Auteur ; Wang, W., Auteur . - 2011 . - pp. 3582–3593. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3582–3593 Mots-clés : Maraging steels Stainless Thermodynamics Precipitation Alloy design Résumé : A general computational alloy design approach based on thermodynamic and physical metallurgical principles, and coupled with a genetic optimization scheme, is presented. The method is applied to the design of new ultra-high-strength maraging stainless steels strengthened by Ni3Ti intermetallics. In the first design round, the alloy composition is optimized on the basis of precipitate formation at a fixed ageing temperature without considering other steps in the heat treatment. In the second round, the alloy is redesigned, applying an integrated model which allows for the simultaneous optimization of alloy composition and the ageing temperature as well as the prior austenitization temperature. The experimental characterizations of prototype alloys clearly demonstrate that alloys designed by the proposed approach achieve the desired microstructures. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S135964541000114X

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A new ultrahigh-strength stainless steel strengthened by various coexisting nanoprecipitates / W. Xu in Acta materialia, Vol. 58 N° 11 (Juin 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 11 (Juin 2010) . - pp. 4067–4075 Titre : A new ultrahigh-strength stainless steel strengthened by various coexisting nanoprecipitates Type de document : texte imprimé Auteurs : W. Xu, Auteur ; P.E.J. Rivera-Díaz-del-Castillo, Auteur ; W. Yan, Auteur Année de publication : 2011 Article en page(s) : pp. 4067–4075 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Maraging steels Stainless Thermodynamics Precipitation Alloy design Résumé : A general computational alloy design approach based on thermodynamic and physical metallurgical principles and coupled with a genetic optimization scheme is presented. The model is applied to develop a new ultrahigh-strength maraging stainless steel. The alloy composition and heat treatment parameters are integrally optimized so as to achieve microstructures of fully lath martensite matrix strengthened by multiple precipitates of MC carbides, Cu particles and Ni3Ti intermetallics. The combined mechanical properties, corrosion resistance and identification of actual strengthening precipitates in the experimental prototype produced on the basic of the model predictions provide a strong justification for the alloy design approach. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001503 [article] A new ultrahigh-strength stainless steel strengthened by various coexisting nanoprecipitates [texte imprimé] / W. Xu, Auteur ; P.E.J. Rivera-Díaz-del-Castillo, Auteur ; W. Yan, Auteur . - 2011 . - pp. 4067–4075. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 11 (Juin 2010) . - pp. 4067–4075 Mots-clés : Maraging steels Stainless Thermodynamics Precipitation Alloy design Résumé : A general computational alloy design approach based on thermodynamic and physical metallurgical principles and coupled with a genetic optimization scheme is presented. The model is applied to develop a new ultrahigh-strength maraging stainless steel. The alloy composition and heat treatment parameters are integrally optimized so as to achieve microstructures of fully lath martensite matrix strengthened by multiple precipitates of MC carbides, Cu particles and Ni3Ti intermetallics. The combined mechanical properties, corrosion resistance and identification of actual strengthening precipitates in the experimental prototype produced on the basic of the model predictions provide a strong justification for the alloy design approach. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001503

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