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        Composition Design of Nanocrystalline Bainitic Steels by Diffusionless Solid Reaction

        Carlos Garcia-Mateo,Francisca G. Caballero,Thomas Sourmail,Juan Cornide,Veronique Smanio,Roberto Elvira 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.3

        NANOBAIN is the term used to refer to a new generation of advanced steels capable of producing by isothermaltransformation at low homologous temperatures, T/Tm~0.25 where Tm is the absolute melting temperature,a nanocrystalline microstructure, composed exclusively of two phases, thin plates of bainitic ferriteseparated by C enriched austenite. Such alloys are exclusively designed on the basis of bainitic transformationtheory and some physical metallurgy principles. In this work, by designing a new set of alloys capable ofproducing such microstructure, a further step toward the industrialization of NANOBAIN is taken. Some importantindustrial requirements, including circumventing the inclusion of expensive alloying elements and theneed for faster transformations, are also considered. For all the alloys, the experimental results validate thedesign procedure and they illustrate that the NANOBAIN concept is a step closer to industrialization, probingthat it is possible to obtain nanocristalline bainite in simpler alloy systems and in shorter times than thosereported previously.

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