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Influence of Aging Treatment on Microstructure and Tensile Properties of a Hot Deformed UNS S32750 Super Duplex Stainless Steel (SDSS) Alloy

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Materials Science and Engineering Faculty, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania
2
University OVIDIUS of Constanta, 900527 Constanta, Romania
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FORJA ROTEC Ltd., Buzau 120224, Romania
*
Author to whom correspondence should be addressed.
Metals 2020, 10(3), 353; https://doi.org/10.3390/met10030353
Received: 11 February 2020 / Revised: 4 March 2020 / Accepted: 6 March 2020 / Published: 8 March 2020
In this present study, the influence of isothermal aging temperature and duration on microstructural and mechanical properties of a hot-deformed UNS S32750 super duplex stainless steel (SDSS) alloy was investigated by SEM-EBSD (scanning electron microscopy-electron backscatter diffraction) and tensile testing techniques. An isothermal aging treatment, at temperatures between 400 and 600 °C and treatment duration between 3 and 120 h, was applied to a commercial UNS S32750 SDSS alloy. Microstructural characteristics of all thermomechanical (TM) processed states, such as distribution and morphology of constituent phases, grain’s modal orientation (MO), and obtained mechanical properties were analysed correlated with the TM processing conditions. The obtained experimental results show that the constituent phases, in all TM processed states, are represented by elongated γ-phase grains within the δ-phase matrix. The R-phase was observed in the case of aging treatment performed at 600 °C for 120 h. Within the δ-phase matrix, dynamically recrystallized grains were identified as a result of applying hot deformation and isothermal aging treatments. Also, it was observed that aging treatment parameters can significantly influence the mechanical behaviour exhibited by the UNS S32750 SDSS alloy, in terms of elongation to fracture and absorbed energy during impact testing. View Full-Text
Keywords: super-duplex stainless steel (SDSS); γ-Fe (austenite); δ-Fe (ferrite); R-phase; microstructure; mechanical properties super-duplex stainless steel (SDSS); γ-Fe (austenite); δ-Fe (ferrite); R-phase; microstructure; mechanical properties
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Cojocaru, E.M.; Raducanu, D.; Nocivin, A.; Cinca, I.; Vintila, A.N.; Serban, N.; Angelescu, M.L.; Cojocaru, V.D. Influence of Aging Treatment on Microstructure and Tensile Properties of a Hot Deformed UNS S32750 Super Duplex Stainless Steel (SDSS) Alloy. Metals 2020, 10, 353.

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