Hot deformation behavior of microstructural constituents in a duplex stainless steel during high-temperature straining

Amir Momeni, Shahab Kazemi, Ali Bahrani

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    Amir Momeni, Shahab Kazemi, and Ali Bahrani, Hot deformation behavior of microstructural constituents in a duplex stainless steel during high-temperature straining, Int. J. Miner. Metall. Mater., 20(2013), No. 10, pp.953-960. https://dx.doi.org/10.1007/s12613-013-0820-6
    Amir Momeni, Shahab Kazemi, and Ali Bahrani, Hot deformation behavior of microstructural constituents in a duplex stainless steel during high-temperature straining, Int. J. Miner. Metall. Mater., 20(2013), No. 10, pp.953-960. https://dx.doi.org/10.1007/s12613-013-0820-6
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    Hot deformation behavior of microstructural constituents in a duplex stainless steel during high-temperature straining

    • Materials Science and Engineering Department, Hamedan University of Technology, Hamedan, 3733-1-65169, Iran

    • Department of Materials Engineering, Faculty of Engineering, Bu Ali Sina University, Hamedan, 4161-65174, Iran

      通信作者:

      Amir Momeni E-mail: ammomeni@aut.ac.ir

    中文摘要

    The hot deformation characteristics of 1.4462 duplex stainless steel (DSS) were analyzed by considering strain partitioning between austenite and ferrite constituents. The individual behavior of ferrite and austenite in microstructure was studied in an iso-stress condition. Hot compression tests were performed at temperatures of 800–1100℃ and strain rates of 0.001–1 s−1. The flow stress was modeled by a hyperbolic sine constitutive equation, the corresponding constants and apparent activation energies were determined for the studied alloys. The constitutive equation and law of mixture were used to measure the contribution factor of each phase at any given strain. It is found that the contribution factor of ferrite exponentially declines as the Zener-Hollomon parameter (Z) increases. On the contrary, the austenite contribution polynomially increases with the increase of Z. At low Z values below 2.6.×1015 (lnZ=35.5), a negative contribution factor is determined for austenite that is attributed to dynamic recrystallization. At high Z values, the contribution factor of austenite is about two orders of magnitude greater than that of ferrite, and therefore, austenite can accommodate more strain. Microstructural characterization via electron back-scattered diffraction (EBSD) confirms the mechanical results and shows that austenite recrystallization is possible only at high temperature and low strain rate.

     

    Hot deformation behavior of microstructural constituents in a duplex stainless steel during high-temperature straining

    Author Affilications

      • Materials Science and Engineering Department, Hamedan University of Technology, Hamedan, 3733-1-65169, Iran

      • Department of Materials Engineering, Faculty of Engineering, Bu Ali Sina University, Hamedan, 4161-65174, Iran

    • Received: 04 January 2013; Revised: 14 February 2013; Accepted: 18 March 2013;
    The hot deformation characteristics of 1.4462 duplex stainless steel (DSS) were analyzed by considering strain partitioning between austenite and ferrite constituents. The individual behavior of ferrite and austenite in microstructure was studied in an iso-stress condition. Hot compression tests were performed at temperatures of 800–1100℃ and strain rates of 0.001–1 s−1. The flow stress was modeled by a hyperbolic sine constitutive equation, the corresponding constants and apparent activation energies were determined for the studied alloys. The constitutive equation and law of mixture were used to measure the contribution factor of each phase at any given strain. It is found that the contribution factor of ferrite exponentially declines as the Zener-Hollomon parameter (Z) increases. On the contrary, the austenite contribution polynomially increases with the increase of Z. At low Z values below 2.6.×1015 (lnZ=35.5), a negative contribution factor is determined for austenite that is attributed to dynamic recrystallization. At high Z values, the contribution factor of austenite is about two orders of magnitude greater than that of ferrite, and therefore, austenite can accommodate more strain. Microstructural characterization via electron back-scattered diffraction (EBSD) confirms the mechanical results and shows that austenite recrystallization is possible only at high temperature and low strain rate.

     

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