Influence of isochronal treatments on microstructure and mechanical properties of solution treated UNS S32750 SDSS alloy specimens
In this study, the influence of isochronal treatments performed at temperatures between 700 °C and 1060 °C and, with a treatment duration of 15 min, on microstructure and mechanical properties of a solution treated UNS S32750 Super Duplex Stainless Steel (SDSS) alloy was investigated by SEM-EBSD (Sc...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-07-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785420313260 |
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| author | Elisabeta Mirela Cojocaru Doina Raducanu Saleh Sabah Alturaihi Anna Nocivin George Coman Vasile Danut Cojocaru |
| author_facet | Elisabeta Mirela Cojocaru Doina Raducanu Saleh Sabah Alturaihi Anna Nocivin George Coman Vasile Danut Cojocaru |
| author_sort | Elisabeta Mirela Cojocaru |
| collection | DOAJ |
| description | In this study, the influence of isochronal treatments performed at temperatures between 700 °C and 1060 °C and, with a treatment duration of 15 min, on microstructure and mechanical properties of a solution treated UNS S32750 Super Duplex Stainless Steel (SDSS) alloy was investigated by SEM-EBSD (Scanning Electron Microscopy-Electron Backscatter Diffraction), tensile testing and, impact testing techniques. Microstructural characteristics, such as: constituent phases, weight fraction, grain-size, morphology and, obtained mechanical properties, such as: absorbed energy, ultimate tensile strength, yield strength and, elongation to fracture were analysed. The isochronal treatments induced changes in relation to alloy’s constituent phases morphology, grain-size and, precipitation of secondary phases. Obtained results show that the microstructure consists of elongated γ-phase grains, due to prior hot-deformation, in a δ-phase matrix. Also, within the δ-phase matrix, secondary phases can precipitate during isochronal treatments. The following secondary phases were identified: γ2-phase, σ-phase and, χ-phase. Changes were observed, also, in recorded mechanical properties, due to precipitation of deleterious secondary phases. The most influential precipitated secondary phase is the σ-phase, which was observed in samples treated at temperatures between 780 °C and 1000 °C and, induced decrease in alloy’s absorbed energy and elongation to fracture, both reaching minimum values, close to 3.3 [J] and, respectively 9 [%]. |
| first_indexed | 2024-12-22T12:53:47Z |
| format | Article |
| id | doaj.art-1031c3d6f14545d6b06e6d527915bdda |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-22T12:53:47Z |
| publishDate | 2020-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-1031c3d6f14545d6b06e6d527915bdda2022-12-21T18:25:09ZengElsevierJournal of Materials Research and Technology2238-78542020-07-019478707879Influence of isochronal treatments on microstructure and mechanical properties of solution treated UNS S32750 SDSS alloy specimensElisabeta Mirela Cojocaru0Doina Raducanu1Saleh Sabah Alturaihi2Anna Nocivin3George Coman4Vasile Danut Cojocaru5Materials Science and Engineering Faculty, University POLITEHNICA of Bucharest, 060042 Bucharest, RomaniaMaterials Science and Engineering Faculty, University POLITEHNICA of Bucharest, 060042 Bucharest, RomaniaMaterials Science and Engineering Faculty, University POLITEHNICA of Bucharest, 060042 Bucharest, RomaniaUniversity OVIDIUS of Constanta, 900527 Constanta, RomaniaMaterials Science and Engineering Faculty, University POLITEHNICA of Bucharest, 060042 Bucharest, RomaniaMaterials Science and Engineering Faculty, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania; Corresponding author.In this study, the influence of isochronal treatments performed at temperatures between 700 °C and 1060 °C and, with a treatment duration of 15 min, on microstructure and mechanical properties of a solution treated UNS S32750 Super Duplex Stainless Steel (SDSS) alloy was investigated by SEM-EBSD (Scanning Electron Microscopy-Electron Backscatter Diffraction), tensile testing and, impact testing techniques. Microstructural characteristics, such as: constituent phases, weight fraction, grain-size, morphology and, obtained mechanical properties, such as: absorbed energy, ultimate tensile strength, yield strength and, elongation to fracture were analysed. The isochronal treatments induced changes in relation to alloy’s constituent phases morphology, grain-size and, precipitation of secondary phases. Obtained results show that the microstructure consists of elongated γ-phase grains, due to prior hot-deformation, in a δ-phase matrix. Also, within the δ-phase matrix, secondary phases can precipitate during isochronal treatments. The following secondary phases were identified: γ2-phase, σ-phase and, χ-phase. Changes were observed, also, in recorded mechanical properties, due to precipitation of deleterious secondary phases. The most influential precipitated secondary phase is the σ-phase, which was observed in samples treated at temperatures between 780 °C and 1000 °C and, induced decrease in alloy’s absorbed energy and elongation to fracture, both reaching minimum values, close to 3.3 [J] and, respectively 9 [%].http://www.sciencedirect.com/science/article/pii/S2238785420313260γ-phaseδ-phaseσ-phaseMicrostructureMechanical properties |
| spellingShingle | Elisabeta Mirela Cojocaru Doina Raducanu Saleh Sabah Alturaihi Anna Nocivin George Coman Vasile Danut Cojocaru Influence of isochronal treatments on microstructure and mechanical properties of solution treated UNS S32750 SDSS alloy specimens Journal of Materials Research and Technology γ-phase δ-phase σ-phase Microstructure Mechanical properties |
| title | Influence of isochronal treatments on microstructure and mechanical properties of solution treated UNS S32750 SDSS alloy specimens |
| title_full | Influence of isochronal treatments on microstructure and mechanical properties of solution treated UNS S32750 SDSS alloy specimens |
| title_fullStr | Influence of isochronal treatments on microstructure and mechanical properties of solution treated UNS S32750 SDSS alloy specimens |
| title_full_unstemmed | Influence of isochronal treatments on microstructure and mechanical properties of solution treated UNS S32750 SDSS alloy specimens |
| title_short | Influence of isochronal treatments on microstructure and mechanical properties of solution treated UNS S32750 SDSS alloy specimens |
| title_sort | influence of isochronal treatments on microstructure and mechanical properties of solution treated uns s32750 sdss alloy specimens |
| topic | γ-phase δ-phase σ-phase Microstructure Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785420313260 |
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