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Effects of solution treatment on mechanical properties and corrosion resistance of 4A duplex stainless steel

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      Abstract

      In this study, 4A duplex stainless steels were prepared via remelting in an intermediate frequency furnace and subsequently solution treated at different temperatures. The effects of solution treatment on the mechanical properties and corrosion resistance of 4A duplex stainless steel were investigated. Microstructures were characterized via optical microscopy and scanning electron microscopy. The mechanical properties were evaluated via hardness test, tensile test, and impact test experiments. The point corrosion resistance was studied via chemical immersion and potentiodynamic anodic polarization. The results showed that with increasing solution temperature in the range of 1 223 – 1 423 K, the tensile strength and hardness first decreased and then increased, and minimum values were obtained at 1 323 K. The σ phase precipitated at the boundaries of the α/γ phases in samples solution treated at 1 223 K, decreasing both impact energy and pitting potential of the experimental steels. When experimental steels were solution treated at 1 373 K for 2 h, a suitable volume fraction of α/γ was uniformly distributed throughout the microstructure, and the steels exhibited optimal mechanical properties and pitting corrosion resistance.

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      Effect of intermetallic precipitations on the properties of duplex stainless steel

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        Kinetics of sigma phase formation in a Duplex Stainless Steel

        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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          Effects of sigma phase precipitation on seawater pitting of duplex stainless steel

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            Author and article information

            Affiliations
            a School of Material Science and Engineering, Henan University of Science and Technology, Luoyang, P.R. China
            b Collaborative Innovation Center of Nonferrous Metals, Henan Province, Henan University of Science and Technology, Luoyang, P.R. China
            Author notes
            [*] Correspondence address, Prof. Dr. Aiqin Wang, School of Material Science and Engineering, Henan University of Science and Technology, Luoyang 471023, Henan Province, P.R. China, Tel.: +86 13938881511, Fax: +86 037964231779, E-mail: aiqin_wang888@123456163.com
            Journal
            ijmr
            International Journal of Materials Research
            Carl Hanser Verlag
            1862-5282
            2195-8556
            12 February 2018
            : 109
            : 2
            : 136-146
            MK111582
            10.3139/146.111582
            © 2018, Carl Hanser Verlag, München
            Counts
            References: 22, Pages: 11
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