Powiadomienia systemowe
- Sesja wygasła!
- Sesja wygasła!
- Sesja wygasła!
- Sesja wygasła!
Tytuł artykułu
Wybrane pełne teksty z tego czasopisma
Identyfikatory
Warianty tytułu
Języki publikacji
Abstrakty
Purpose: This work deals with the study of the background to the formation of branched cracks in a continuously-cast slab, at pulling rate 0.43 m.min-1. Design/methodology/approach: Samples were taken from the individual cut-outs for further analyzes. Macroscopic analysis was used to evaluate the surface quality of the analysed slabs using a Leica Wild M3Z macroscope. The microstructure was observed with an OLYMPUS VANOX-T light microscope. For the evaluation of the concentration profile of the selected elements in planes parallel to the slab surface, wavelength dispersive X-ray analysis (WDX) was used with a Camebax-MICROanalyzer. Findings: The results of the work show that branched cracks extended to a depth of 10 mm below the slab surface and occurred mostly below oscillation marks. Cracks were mostly present in the edge parts of the slab, where they were also deeper in comparison with locations in the middle of the slab width. Microstructural analysis confirmed heterogeneity of ferrite grain sizes in the slab surface skin. Wavelength-dispersive X-ray analysis of a sample with a branched crack showed chemical heterogeneity of harmful elements, mainly S and As. Research limitations/implications: Precipitation of microalloying elements in connection with the cementite can lead to higher probability of surface crack formation, as also confirmed in this study. Originality/value: of this work is background of branched crack formation in surface zone of continuously-cast Ti-Nb microalloyed steel slab.
Wydawca
Rocznik
Tom
Strony
58--64
Opis fizyczny
Bibliogr. 15 poz., rys., tab.
Twórcy
autor
- ŽP Research and Development Centre, Kolkáreň 35, 976 81 Podbrezová, Slovakia
- Department of Materials Science, Technical University of Košice, Park Komenského 11, 042 00 Košice, Slovakia
autor
- Department of Materials Science, Technical University of Košice, Park Komenského 11, 042 00 Košice, Slovakia
autor
- Department of Materials Science, Technical University of Košice, Park Komenského 11, 042 00 Košice, Slovakia
autor
- Department of Materials Science, Technical University of Košice, Park Komenského 11, 042 00 Košice, Slovakia
autor
- SVÚM a.s., Institute of Research Area, Podnikatelská 565, 190 11 Praha 9 - Běchovice, Czech Republic
autor
- U.S.STEEL Košice, s.r.o., Research and Development Centre, 044 54 Košice, Slovakia
autor
- U.S.STEEL Košice, s.r.o., Research and Development Centre, 044 54 Košice, Slovakia
Bibliografia
- [1] R. Mišičko, Structure and defects of continuously-cast steel semis, Technical University of Košice, Faculty of Metallurgy, First edition, Emilena, 2007 (in Slovak).
- [2] M. Longauerová, Segregation and precipitation at continuous casting, First edition, Technical University of Košice, Faculty of Metallurgy, 2006 (in Slovak).
- [3] P. Marek, A. Ševčík, Surface Defects in Low Carbon Steel Slabs, in: M. Longauerová, G. Janák (eds.), The 1st International Conference Physical Metallurgy and Fracture of Materials ́99, Herľany, Slovak Republic, 1999, 261-264.
- [4] P. Marek, A. Ševčík, Effect of technological conditions on the surface quality of continuously cast slabs, Oceľové plechy 23/1 (1996) 9-18 (in Slovak).
- [5] A. Ševčík, P. Marek, Analysis of the causes of surface defects in continuously cast slabs of steel KOHAL 280, Oceľové plechy 11/1 (1984) 8-11 (in Slovak).
- [6] P. Bekeč, M. Longauerová, M. Vojtko, Influence of Casting Rate on TiNb Microalloyed Steel Slab Surface Area Microstructure, Materials Science Forum 782 (2014) 81-86.
- [7] Takeuchi, E., Brimacombe, J.K.: Effect of Oscillation-Mark Formation on the Surface Quality of Continuously Cast Steel Slabs, Metallurgical Transactions B 16 (1985) 605-625.
- [8] M. Longauerová, Surface microstructural heterogeneity of microalloyed slabs, Conference Contribution of metallography to solving production problems, 14-17.06.2005, Spa Libverda, 28-32 (in Slovak).
- [9] M. Longauerová, et al., Effect of Casting Rate on Ti-Nb Microalloyed Steel Slab Surface Zone Micro-structure, Acta Metallurgica Slovaca – Conference 1 (2010) 167-172.
- [10] M. Longauerová, et al., Distribution of microalloying elements and impurities in surface zone of CC IF steel, Ironmaking and Steelmaking 36/3 (2009) 176-185.
- [11] M. Longauerová, et al., Heterogeneity of brittle-fracture properties across width of the slab from IF steel, Proceedings of the Conference Fractography 2006, Stará Lesná, 15-18.10.2006, IMR SAS Košice, Slovak Republic, 220-226 (in Slovak).
- [12] P. Bekeč, M. Longauerová, Effect of cooling rate on the microstructure of slabs surface area from Ti-Nb microalloyed steel, Metalurgia Junior 2010, 26-27.05. 2010, Košice, 101-105 (in Slovak).
- [13] M. Longauerová, P. Bekeč, M. Vojtko, S. Longauer, P. Marek, Influence of cooling rate on TiNb micro-alloyed steel slab surface zone fracture morphology, Acta Metallurgica Slovaca – Conference 3 (2013) 30-39.
- [14] H. Baker (ed.), ASM Handbook, Alloy Phase Diagrams, Vol. 3, ASM International, 1992.
- [15] V. Ludlow, et. al., Understanding the role of micro-alloy precipitates in the surface cracking of continuously cast slab, Acta Metallurgica Slovaca 13 (2007) 48-57.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-b4c8ae19-ec77-49f4-852a-7383a580176c