Formation of Sulphides in As-Cast GOES Thin Strips

Abstract:

This paper deals with the formation of sulphides in as-cast grain-oriented electrical steel (GOES) thin strip during solidification and subsequent cooling through the (δ + γ) field. Chemical composition of the strip was as follows, in mass %: 0.034 C, 2.81 Si, 0.06 Mn, 0.024 S, 0.20 Cr, 0.15 Cu, 0.055 Ni, 0.0011 Ti, 0.0056 N and 0.002 Al. It was found out that chemical composition of coarse sulphides, formed in the area of final solidification, was very different from the composition of fine sulphides precipitated in the two-phase region. Coarse sulphides were rich in iron. Fine complex sulphides were identified as the Cr₂CuS₄ phase. The effect of fine sulphides on the austenite decomposition at the end of the (δ + γ) field was studied.

• Periodical: Materials Science Forum (Volume 1082)
• Pages: 177-182
• DOI: https://doi.org/10.4028/p-shp1f0
• Online since: March 2023
• Authors: Kryštof Hradečný*, Renáta Palupčíková, Anastasia Volodarskaja, Vlastimil Vodárek
• Keywords: (δ + γ) Field, GOES, Solidification, Sulphides, Widmanstätten Austenite

References

[1] H. Y. Song, H. T. Liu, H. H. Lu, H. Z. Li, W. Q. Liu, X. M. Zhang, G. D. Wang, Effect of hot rolling reduction on microstructure, texture and ductility of strip-cast grain-oriented silicon steel with different solidification structures, Materials Science and Engineering: A. 605 (2014) 260-269.

DOI: 10.1016/j.msea.2014.03.052

[2] J. Y., Park, K. H., Oh, H. Y, Ra, Microstructure and crystallographic texture of strip-cast 4.3 wt.% Si steel sheet, Scripta materialia, 40 (8) (1999) 881-885.

DOI: 10.1016/s1359-6462(99)00044-5

[3] H.-Y. Song, et al., Microstructure and texture evolution of strip casting grain-oriented silicon steel, IEEE Transactions on Magnetics, 51 (11) (2015) 1-4.

DOI: 10.1109/intmag.2015.7156865

[4] Z. Xia, Y. Kang, Q. Wang, Developments in the production of grain-oriented electrical steel, Journal of Magnetism and Magnetic Materials, 320 (23) (2008) 3229-3233.

DOI: 10.1016/j.jmmm.2008.07.003

[5] Y. Hayakawa. Mechanism of secondary recrystallization of Goss grains in grain-oriented electrical steel, Science and Technology of Advanced Materials, 18 (1) (2017) 480-497

DOI: 10.1080/14686996.2017.1341277

[6] K. Günther, et al., Recent Technology Developments in the Production of Grain-Oriented Electrical Steel. Steel research international, 76 (6) (2005) 413-421.

DOI: 10.1002/srin.200506030

[7] T. Kubota, M. Fujikura, Y. Ushigami, Recent progress and future trend on grain-oriented silicon steel, Journal of Magnetism and Magnetic Materials, 215 (2000) 69-73.

DOI: 10.1016/s0304-8853(00)00069-x

[8] H. T. Liu, S. J. Yao, Y. Sun, F. Gao, H. Y. Song, G. H. Liu, G. D. Wang, Evolution of microstructure, texture and inhibitor along the processing route for grain-oriented electrical steels using strip casting, Materials Characterization, 106 (2015) 273-282.

DOI: 10.1016/j.matchar.2015.06.010

[9] V. Vodárek, C. P. Reip, A. Volodarskaja, Microstructure Evolution in Belt-Casted Strip of Grain Oriented Electrical Steel, Trans Tech Publications Ltd. Key Engineering Materials, 810 (2019) 82-88.

DOI: 10.4028/www.scientific.net/kem.810.82

[10] Y. Ohmori, K. Nakai, H. Ohtsubo, Y. Isshiki. Mechanism of Widmanstätten austenite formation in a δ/γ duplex phase stainless steel, ISIJ international, 35 (8) (1995) 969-975.

DOI: 10.2355/isijinternational.35.969

[11] H. Y. Song, H. T. Liu, G. D. Wang, J. J. Jonas, Formation of Widmanstätten austenite in strip cast grain-oriented silicon steel, Metallurgical and Materials Transactions A, 48 (4) (2017) 1959-1968.

DOI: 10.1007/s11661-017-3975-3

[12] W. B. Pearson, A handbook of lattice spacings and structures of metals and alloys, London, Pergamon Press, 1958.