Design of Advanced Bainitic Steels by Optimisation of TTT Diagrams and T_0 Curves

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著者

    • CABALLERO Francisca Garcia
    • Materalia Research Group, Department of Physical Metallurgy, Centro Nacional de Investigaciones Metalurgicas (CENIM), Consejo Superior de Investigaciones Cientificas (CSIC)
    • SANTOFIMIA Maria Jesus
    • Materalia Research Group, Department of Physical Metallurgy, Centro Nacional de Investigaciones Metalurgicas (CENIM), Consejo Superior de Investigaciones Cientificas (CSIC)
    • CAPDEVILA Carlos
    • Materalia Research Group, Department of Physical Metallurgy, Centro Nacional de Investigaciones Metalurgicas (CENIM), Consejo Superior de Investigaciones Cientificas (CSIC)
    • GARCIA-MATEO Carlos
    • Materalia Research Group, Department of Physical Metallurgy, Centro Nacional de Investigaciones Metalurgicas (CENIM), Consejo Superior de Investigaciones Cientificas (CSIC)
    • GARCIA DE ANDRES Carlos
    • Materalia Research Group, Department of Physical Metallurgy, Centro Nacional de Investigaciones Metalurgicas (CENIM), Consejo Superior de Investigaciones Cientificas (CSIC)

抄録

Cementite is responsible of the limited application of conventional bainitic steels, however it has been proof that cementite precipitation during bainite formation can be suppressed by the judicious use of silicon in medium carbon steels. In this work, thermodynamic and kinetic models were used to design steels with an optimum bainitic microstructure consisting of a mixture of bainitic ferrite, carbon-enriched retained austenite and some martensite. Using these models, a set of seven carbide free bainitic steels with a 0.3 wt% carbon content were proposed for manufacturing. The work presented here is concerned with the microstructural and mechanical characterisation of the steels manufactured. Except for the steel with the highest content of alloying elements, all the grades present the same microstructure composed of carbide-free upper bainite and retained austenite after hot rolling and a two-steps cooling. Theirs tensile strengths range from 1600 to 1950 MPa while keeping a uniform elongation equal to 4% and a total elongation over 10%. Regarding toughness at room temperature, they match quenched and tempered martensitic steels.

収録刊行物

  • ISIJ international  

    ISIJ international 46(10), 1479-1488, 2006-10-15 

    The Iron and Steel Institute of Japan

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