Effects of Nozzle and Roll on Surface Condition of Al-1%Si Strip Cast Using Vertical type High Speed Twin Roll Caster

Abstract:

When a strip of Al-Si alloy with an Si content of 1% was cast using a vertical-type high-speed twin-roll caster, cracks form in its surface. The effects of the pouring method, the shape and position of the nozzle, and the roll surface texture on surface crack formation were evaluated with a roll caster. The rolls were made of a copper alloy, and the roll speed was 30 m/min. The as-cast strips were bent to investigate the degree of crack formation, and the outer surface of the strips was observed without magnification and with a stereomicroscope to determine the influence of the pouring method, the shape and position of the nozzle, and the roll surface. A roll machined to form V-shaped grooves 0.4 mm deep on the surface of the strips was most useful for reducing surface cracking. Changing the shape of the nozzle tip was second-most effective. There was a clear correlation between the roll surface condition and surface cracking in the Al-Si strip.

• Periodical: Materials Science Forum (Volume 1042)
• Pages: 53-59
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1042.53
• Online since: August 2021
• Authors: Toshio Haga*, Tomoya Okada, Shinichi Nishida, Hisaki Watari
• Keywords: High Speed Twin Roll Caster, Nozzle, Roll Surface, Strip Surface, Surface Crack

References

[1] T. Haga, K. Takahashi, H. Watari: Semisolid strip casting using a vertical type twin roll caster, Materials Science Forum 426 (2003) 477-482.

DOI: 10.4028/www.scientific.net/msf.426-432.477

[2] T. Haga, K. Takahashi, M. Ikawa: A vertical type twin roll caster for aluminum alloy strip, J. Mater. Process Technol. 140 (2003) 610-615.

DOI: 10.1016/s0924-0136(03)00835-5

[3] T. Haga, M. Ikawa, S. Kumai: A high speed twin roll caster for aluminum alloy thin strip, Trans. Mat. Res. Soc. Japan Vol. 29 (2004), pp.1823-1828.

DOI: 10.1299/jsmeintmp.2005.2_5

[4] T. Haga, Development of a twin roll caster for light metals, J. Achiev. Mater. Manuf. Eng. 　43(2010) 393-402.

[5] K. Komeda, T. Haga, S. Kumai, High speed twin roll casting of Al-Mg alloys, Advanced Materials Research 154-155 (2011) 1544-1548.

DOI: 10.4028/www.scientific.net/amr.154-155.1544

[6] T.Haga, Strip Casting of Recycled Aluminum alloys by a Twin Roll Caster, Waste and Biomass Valorization 3,4(2012) 419-424.

DOI: 10.1007/s12649-012-9153-3

[7] Y. Li, C. He, J. Li, Z. Wang, D. Wu, G. Xu, A novel approach to improve the microstructure and mechanical properties of Al-Mg-Si aluminum alloys during twin-roll casting, Metals 13,1713(2020).

DOI: 10.3390/ma13071713

[8] Z. Xu, S. Wang, H. Wang, H. Song, S. Li, X. Chen, Effect of cooling rate on Microstructure and properties of twin-roll casting 6061 aluminum alloy sheet, Metals 10,1168(2020).

DOI: 10.3390/met10091168

[9] R. Cook, P. G. Groock, P. M. Thomas, D. V. Edmonds, J. D. Hunt: Development of the twin-roll casting process, J. Mater. Process. Technol. 55(2) (1995) 76-84.

DOI: 10.1016/0924-0136(95)01788-7

[10] M. Cortes, Pechiney- Jumbo 3 CM super ((R)) the new demands of thin strip casting, Light Met. (1995) 1161-1164.

[11] B. Taraglio, C. Romanowski, Thin-gage/high-speed roll casting technology for foil production, Light Met. (1995) 1165-1182.

[12] A. I. Nussbaum, Three-state-of-the-art Thin –gage high-speed roll caster for aluminum alloy sheet products, Light Met. Age, 12 (1996) 8-19.

[13] O. Daaland, A. B. Espedal, M. L. Nedreberg, I. Alvestad, Thin gage twin-roll casting, process capabilities and product quality, Light Met. (2016) 989-996.

DOI: 10.1007/978-3-319-48228-6_125

[14] A.I. Nussbaum, Three-state-of-the-art Thin –gage high-speed roll caster for aluminum alloy sheet products Part III, Light Met Age, 55(1997)34-39.

[15] O. Daland, A.B. Espedal, M.L. Nedreberg, I. Alvestad, Thin gage twin-roll casting, process capabilities and product quality, Light Met. (1997) 745-752.

DOI: 10.1007/978-3-319-48228-6_125

[16] P.Y. Menet, R. Cayol, J. Moriceau, Pechiney Jumbo 3CM TM, start-up of the Neu-Brisach thin strip caster, Light Met. (1997) 753-756.

[17] P.M. Thomas, P.G. Grocock, J.M. Bouzendorffer, Dynamic strip caster-An update on the operation of the roll caster at Eurofoil, Metall Plant Technol. Int. 20 (1997) 44-52.

[18] S.Hamers, D.Smith, C.Romanowski, G.Yildizbayrak, B.Taraglio, Twin roll casting of aluminum at 2.5mm gauge. Production experience and process improvement, Light Met. (1999)931-937.

[19] J.Benedyk, Thin strip casting for aluminum alloy sheet applications developed by Pechiney at Neuf-Brisach, Light Met Age 59(2001)28-30.

[20] S.Hamer, C.Romanowski, B.Taraglio, Continuous casting and rolling of aluminum: Analysis of capacities, products ranges, and Technology, Light Met Age 60(2002)6-17.

[21] M.Duendar, OE.Keles, B.Kerti, N.Dogan, Crystallographic texture development of twin-roll cast aluminum strips, Light Met. (2004)723-724.

[22] Ch. Gras, M.Meredith, J.D. Hund, Microdefects for mation during the roll casting of Al-Mg-Mn aluminum alloys, J.Mater.Process.Technol. 167(2005)62-72.

DOI: 10.1016/j.jmatprotec.2004.09.084

[23] T. Yamashiki，T. Haga，S. Kumai，H. Watari, Investigation of the influence of the roll surface on the cast strip at the casting using a vertical type high speed twin roll caster, Advanced Materials Research 184-185 (2012) 271-276.

DOI: 10.4028/www.scientific.net/amm.184-185.271