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Kinetics of sigma phase formation in a Duplex Stainless Steel

1

Materials Research

ABM, ABC, ABPol

duplex stainless steels, sigma phase, phase transformations, kinetics

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      Abstract

      This work determines the kinetics of sigma phase formation in UNS S31803 Duplex Stainless Steel (DSS), describing the phase transformations that occur in isothermal aging between 700 and 900 ºC for time periods up to 1032 hours, allowing the determination of the Time-Temperature-Precipitation (TTP) diagram for sigma phase and proposing a model to predict the kinetics of sigma phase formation using a Johnson-Mehl-Avrami (JMA) type expression. The higher kinetics of sigma phase formation occurs at 850 ºC. However, isothermal aging between 700 and 900 ºC for time periods up to 1032 hours are not sufficient to the establishment of thermodynamic equilibrium. Activation energy for both nucleation and growth of sigma phase is determined (185 kJ.mol-1) and its value is equivalent to the activation energy for Cr diffusion in ferrite, indicating that diffusion of Cr is probably the major thermally activated process involved in sigma phase formation. The determined JMA type expression presents good fit with experimental data between 700 and 850 ºC.

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      Most cited references 25

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      Super duplex stainless steels

       J.-O. Nilsson (2013)
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        Preferential precipitation site of sigma phase in duplex stainless steel weld metal

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          Solute diffusion in alpha- and gamma-iron

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            Author and article information

            Affiliations
            [1 ] Ignatian Educational Foundation Brazil
            Contributors
            Role: ND
            Journal
            mr
            Materials Research
            Mat. Res.
            ABM, ABC, ABPol (São Carlos )
            1980-5373
            September 2009
            : 12
            : 3
            : 321-327
            S1516-14392009000300012
            10.1590/S1516-14392009000300012

            http://creativecommons.org/licenses/by/4.0/

            Product
            Product Information: SciELO Brazil
            Categories
            ENGINEERING, CHEMICAL
            MATERIALS SCIENCE, MULTIDISCIPLINARY
            METALLURGY & METALLURGICAL ENGINEERING

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