Abstract
Solidification castings can exhibit a columnar or an equiaxed morphology or a combination of both. Since the relative proportions of these two components strongly influence the internal quality of cast product, the study of morphological transition from columnar to equiaxed structure (CET) becomes important. The transition also affects quality parameters like inclusion distribution in castings which has a significant bearing on the properties of cast products. In this work, a combined model for CET and inclusion distribution in continuously cast steel billets is presented. A conduction based transient thermal solidification model is employed in conjunction with Hunt’s criterion for CET to predict the evolution of melt temperature, the location of transition and area-fractions of columnar and equiaxed zones across the billet cross-section. A correlation between melt temperature and equiaxed nuclei density is proposed and incorporated in the model to account for a more realistic variation of CET with melt superheat. The model is compared with available experimental data and is used to explore the effect of process parameters on CET and determine the spatial distribution of non-metallic inclusions in the solidified billet.
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References
Beckermann C, and Wang C Y, Ann Rev Heat Transf 6 (1995) 115.
Prescott P J, and Incropera F P, Adv Heat Transf 28 (1996) 231.
Pardeshi R, Dutta P, and Singh A K, Ind Eng Chem Res 48.19 (2009) 8789.
Flood S C, and Hunt J D, ASM Handbook, Materials Park, OH 15 (1998) p 130.
Ghosh A, Sadhana 26 (2001) 5.
Kurz W, Bezencon C, and Gaumann M, Sci Technol Adv Mater 2 (2001) 185.
Gupta A, Cecen A, Goyal S, Singh A K, and Kalidindi S R, Acta Mater 91 (2015) 239.
Gupta A, Goyal S, Padmanabhan K A, Singh A K, Int J Adv Manuf Technol 77(2015) 565.
Walton D, and Chalmers B, Trans TMS-AIME 215 (1959) 447.
Chalmers B, Principles of Solidification, Wiley, New York, NY (1964), p 255.
Biloni N, and Chalmers B, J Mater Sci 3 (1968) 139.
Morando R, Biloni H, Cole G S, and Bulling G F, Metall Mater Trans 1 (1970) 1407.
Chalmers B, J Aust Inst Metals 8 (1963) 255.
Itoh Y, Takao S, Okajima T, and Tashiro K, Tetsu-to-Hagane 66 (1980) 710.
Hunt, J D, Mater Sci Eng 65.1 (1984) 75
Flood S C, and Hunt J D, J Cryst Growth 82.3 (1987) 543.
Dustin I, and Kurz W, Z Metall 77.5 (1986) 265.
Dong H B, and Lee P D, ActaMater 53.3 (2005) 659.
Martorano M A, and Biscuola V B, Acta Mater 57.2 (2009) 607.
Straffelini G, Lutterotti L, Tonolli M, and Lestani M, ISIJ Int 51.9 (2011) 1448.
Duggan G, Tong M, and Browne D J, Comput Mater Sci 97 (2015) 285.
Wang C Y, and Beckermann C, Metall Mater Trans A 25.5 (1994) 1081.
Martorano M A, Beckermann C, and Gandin C A, Metall Mater Trans A 34.8 (2003) 1657.
Jung H, Mangelinck Noel N, Nguyen H, Billia B, Reinhart G, and Buffet A, Metall Mater Int 15.1 (2009) 21.
Doherty R D, Cooper P D, and Bradbury M H, Metall Trans A 8.3 (1977) 397.
Choudhary S K, and Ghosh A, ISIJ Int 34.4 (1994) 338.
Choudhary S K, and Ganguly S, ISIJ Int 47.12 (2007) 1759.
Oksman P, Yu S, Kytonen H, and Louhenkilpi S, Acta Polytech Hung 11.9 (2014) 5.
Thomas B G, Samarasekera, I V, and Brimacombe J K, Metall Trans B, 18.1 (1987) 119.
Cramb A, The Making, Shaping and Treating of Steel, 11th edition, Casting Volume, AIST (2010).
Sengupta J, Thomas B G, and Wells M A, Metall Mater Trans A 36A (2005) 187.
Brimacombe J K, Agarwal P K, Hibbins S, Prabhakar B, and Baptista L A, Iron Steel Soc 2 (1984) 109.
Shibata H, Itoyama S, Kishimoto Y, Takeuchi S, and Sekiguchi H, ISIJ Int 46.6 (2006) 921.
Meng Y, and Thomas B G, Metall Mater Trans B 34B.5 (2003) 685.
Long M, Zhang L, and Fei Lu F, ISIJ Int 50.12 (2010) 1792.
Mapelli C, and Baragiola S, Ironmak Steelmak 35.6 (2008) 441.
Zhang L, and Thomas B G, in XXIV National Steelmaking Symposium, Morelia, Mich, Mexico (2003) 138.
Fehérvári G, Gábor Verő B, Kardos I, and Csepeli Z, Mater Sci Forum 537 (2007) 345.
Acknowledgments
The authors wish to thank Dr. B.P. Gautham, Principal Scientist, TRDDC for his assistance with the trials, support and valuable discussions. Authors also wish to acknowledge the encouragement and support from TCS CTO, Mr. K Ananth Krishnan, and TRDDC Process Engineering Lab Head, Dr. Pradip.
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Chaube, S., Tennyson, G. & Singh, A. Modelling of Columnar-to-Equiaxed Transition and Inclusion Distribution in Continuously Cast Steel Billets. Trans Indian Inst Met 68, 1207–1213 (2015). https://doi.org/10.1007/s12666-015-0705-7
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DOI: https://doi.org/10.1007/s12666-015-0705-7