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Metals 2017, 7(9), 368; doi:10.3390/met7090368

Isothermal Austenite–Ferrite Phase Transformations and Microstructural Evolution during Annealing in Super Duplex Stainless Steels

Department of Mechanical Engineering, Politecnico di Milano, via La Masa 34, 20156 Milano, Italy
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Received: 17 July 2017 / Revised: 29 August 2017 / Accepted: 8 September 2017 / Published: 14 September 2017
(This article belongs to the Special Issue Microstructure based Modeling of Metallic Materials)
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Abstract

Super Duplex Stainless Steels (SDSSs) are composed of α-ferrite and γ-austenite grains, the simultaneous presence of which forms an optimal microstructure to achieve the best combination of mechanical and corrosion resistance properties. Moreover, international quality standards are strict about the phase fraction ratio. The purpose of this work is the achievement of a better description of the phase ratio evolution taking place during annealing at 1080 °C in the super duplex stainless steels F53–S32750 and F55–S32760. The experimental results show a damped sinusoidal trend in the α/γ phase ratio evolution with the increase of the soaking time of thermal treatment. This can be described by coupling both the competitive coarsening growth regime and the concept of the local equilibrium phase transformations, pointing out a good correspondence with the experimental data. Further, recrystallization phenomena also play a major role. Finally, the additivity character of the observed processes has been proven. View Full-Text
Keywords: duplex stainless steel; isothermal austenite–ferrite transformation; multicomponent diffusion; local equilibrium; additivity rule duplex stainless steel; isothermal austenite–ferrite transformation; multicomponent diffusion; local equilibrium; additivity rule
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Ciuffini, A.F.; Barella, S.; Di Cecca, C.; Gruttadauria, A.; Mapelli, C.; Mombelli, D. Isothermal Austenite–Ferrite Phase Transformations and Microstructural Evolution during Annealing in Super Duplex Stainless Steels. Metals 2017, 7, 368.

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