Hot Ductility of TiNb IF Steel Slab after Hot Torsion Testing
The aim of the work was to evaluate the hot ductility loss in TiNb stabilized IF steel directly from the continuously-cast slab using hot torsion testing (plastometry) in the temperature range 600−1250 °C according to the basic programme, and also after temperature cycling. A good...
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MDPI AG
2019-07-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/9/7/752 |
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| author | Jana Konrádyová Margita Longauerová Petr Jonšta Zdeněk Jonšta Svätoboj Longauer Vladimír Girman Marek Vojtko Aleš Bořuta Miloš Matvija Martin Fujda Jana Dobrovská |
| author_facet | Jana Konrádyová Margita Longauerová Petr Jonšta Zdeněk Jonšta Svätoboj Longauer Vladimír Girman Marek Vojtko Aleš Bořuta Miloš Matvija Martin Fujda Jana Dobrovská |
| author_sort | Jana Konrádyová |
| collection | DOAJ |
| description | The aim of the work was to evaluate the hot ductility loss in TiNb stabilized IF steel directly from the continuously-cast slab using hot torsion testing (plastometry) in the temperature range 600−1250 °C according to the basic programme, and also after temperature cycling. A good match of the temperature dependences of number of turns to failure (N<sub>f</sub>) and intensity of deformation S<sub>e</sub> was confirmed. In both cases, the existence of three temperature areas with decrease in plasticity to a minimum was confirmed. The two-stage temperature cycling according to the CT1150 and CT900 programmes mostly resulted in a decrease in plasticity compared to the basic programme. The most significant effect of cycling was related to the CT900 programme below the maximum plasticity in the base programme at 850 °C. A less pronounced decrease was observed for CT1150 cycling below the maximum plasticity in the base program at 1050 °C. In the case of CT1150 cycling, more complex particles were observed at the fractures compared with the basic programme, namely carbonitrides of Ti and Nb in combination with oxisulfides respectively, then Ti nitrides with oxisulfides or oxides and, in addition, complex (Fe,Nb)P<sub>4</sub>, (Ti,Nb)<sub>3</sub>S<sub>4</sub> type particles. Their mean size determined statistically using TEM was much finer, only 20 nm versus 42 nm in the basic programme. Similarly, CT900 cycling revealed finer particles with an average size of 37 nm compared to 105 nm in the basic programme. The observed particles were Al oxides, Ti(N,C) and (Ti,Nb)<sub>2</sub>S, in contrast to the particles probably of TiFe and FeMnS in the basic programme. The decrease in plasticity corresponded to the finer particles, newly created in the temperature cycling. |
| first_indexed | 2024-12-11T09:14:15Z |
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| id | doaj.art-0802d725337c4fc098e8cf8568558a9f |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-11T09:14:15Z |
| publishDate | 2019-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-0802d725337c4fc098e8cf8568558a9f2022-12-22T01:13:25ZengMDPI AGMetals2075-47012019-07-019775210.3390/met9070752met9070752Hot Ductility of TiNb IF Steel Slab after Hot Torsion TestingJana Konrádyová0Margita Longauerová1Petr Jonšta2Zdeněk Jonšta3Svätoboj Longauer4Vladimír Girman5Marek Vojtko6Aleš Bořuta7Miloš Matvija8Martin Fujda9Jana Dobrovská10Institute of Materials and Quality Engineering, Faculty of Materials, Metallurgy and Recycling, Technical University of Košice, Letná 9, 042 00 Košice, SlovakiaInstitute of Materials and Quality Engineering, Faculty of Materials, Metallurgy and Recycling, Technical University of Košice, Letná 9, 042 00 Košice, SlovakiaFaculty of Materials Science and Technology, VŠB–TU Ostrava, 17. listopadu 2172/15, 708 00 Ostrava-Poruba, Czech RepublicFaculty of Materials Science and Technology, VŠB–TU Ostrava, 17. listopadu 2172/15, 708 00 Ostrava-Poruba, Czech RepublicInstitute of Materials and Quality Engineering, Faculty of Materials, Metallurgy and Recycling, Technical University of Košice, Letná 9, 042 00 Košice, SlovakiaInstitute of Physics, Faculty of Science, Pavol Jozef Šafárik University in Košice, 041 80 Košice, SlovakiaInstitute of Materials Research, Slovak Academy of Science, 040 01 Košice, SlovakiaMaterial & Metallurgical Research Ltd., 703 00 Ostrava, Czech RepublicInstitute of Materials and Quality Engineering, Faculty of Materials, Metallurgy and Recycling, Technical University of Košice, Letná 9, 042 00 Košice, SlovakiaInstitute of Materials and Quality Engineering, Faculty of Materials, Metallurgy and Recycling, Technical University of Košice, Letná 9, 042 00 Košice, SlovakiaFaculty of Materials Science and Technology, VŠB–TU Ostrava, 17. listopadu 2172/15, 708 00 Ostrava-Poruba, Czech RepublicThe aim of the work was to evaluate the hot ductility loss in TiNb stabilized IF steel directly from the continuously-cast slab using hot torsion testing (plastometry) in the temperature range 600−1250 °C according to the basic programme, and also after temperature cycling. A good match of the temperature dependences of number of turns to failure (N<sub>f</sub>) and intensity of deformation S<sub>e</sub> was confirmed. In both cases, the existence of three temperature areas with decrease in plasticity to a minimum was confirmed. The two-stage temperature cycling according to the CT1150 and CT900 programmes mostly resulted in a decrease in plasticity compared to the basic programme. The most significant effect of cycling was related to the CT900 programme below the maximum plasticity in the base programme at 850 °C. A less pronounced decrease was observed for CT1150 cycling below the maximum plasticity in the base program at 1050 °C. In the case of CT1150 cycling, more complex particles were observed at the fractures compared with the basic programme, namely carbonitrides of Ti and Nb in combination with oxisulfides respectively, then Ti nitrides with oxisulfides or oxides and, in addition, complex (Fe,Nb)P<sub>4</sub>, (Ti,Nb)<sub>3</sub>S<sub>4</sub> type particles. Their mean size determined statistically using TEM was much finer, only 20 nm versus 42 nm in the basic programme. Similarly, CT900 cycling revealed finer particles with an average size of 37 nm compared to 105 nm in the basic programme. The observed particles were Al oxides, Ti(N,C) and (Ti,Nb)<sub>2</sub>S, in contrast to the particles probably of TiFe and FeMnS in the basic programme. The decrease in plasticity corresponded to the finer particles, newly created in the temperature cycling.https://www.mdpi.com/2075-4701/9/7/752interstitial-free (IF) steelhot torsion testembrittlementhot ductility lossthermal cycling |
| spellingShingle | Jana Konrádyová Margita Longauerová Petr Jonšta Zdeněk Jonšta Svätoboj Longauer Vladimír Girman Marek Vojtko Aleš Bořuta Miloš Matvija Martin Fujda Jana Dobrovská Hot Ductility of TiNb IF Steel Slab after Hot Torsion Testing Metals interstitial-free (IF) steel hot torsion test embrittlement hot ductility loss thermal cycling |
| title | Hot Ductility of TiNb IF Steel Slab after Hot Torsion Testing |
| title_full | Hot Ductility of TiNb IF Steel Slab after Hot Torsion Testing |
| title_fullStr | Hot Ductility of TiNb IF Steel Slab after Hot Torsion Testing |
| title_full_unstemmed | Hot Ductility of TiNb IF Steel Slab after Hot Torsion Testing |
| title_short | Hot Ductility of TiNb IF Steel Slab after Hot Torsion Testing |
| title_sort | hot ductility of tinb if steel slab after hot torsion testing |
| topic | interstitial-free (IF) steel hot torsion test embrittlement hot ductility loss thermal cycling |
| url | https://www.mdpi.com/2075-4701/9/7/752 |
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