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Structural Zones in Large Static Ingot. Forecasts for Continuously Cast Brass Ingot

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Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Some metallographic studies performed on the basis of the massive forging steel static ingot, on its cross-section, allowed to reveal the following morphological zones: a/ columnar grains (treated as the austenite single crystals), b/ columnar into equiaxed grains transformation, c/ equiaxed grains at the ingot axis. These zones are reproduced theoretically by the numerical simulation. The simulation was based on the calculation of both temperature field in the solidifying large steel ingot and thermal gradient field obtained for the same boundary conditions. The detailed analysis of the velocity of the liquidus isotherm movement shows that the zone of columnar grains begins to disappear at the first point of inflection and the equiaxed grains are formed exclusively at the second point of inflection of the analyzed curve. In the case of the continuously cast brass ingots three different morphologies are revealed: a/ columnar structure, b/ columnar and equiaxed structure with the CET, and c/ columnar structure with the single crystal formation at the ingot axis. Some forecasts of the temperature field are proposed for these three revealed morphologies. An analysis / forecast of the behavior of the operating point in the mold is delivered for the continuously cast ingot. A characteristic delay between some points of breakage of the temperature profile recorded at the operating point and analogous phenomena in the solidifying alloy is postulated.
Rocznik
Strony
141--146
Opis fizyczny
Bibliogr. 19 poz., il., rys., wykr.
Twórcy
  • Institute of Metallurgy and Materials Science, Reymonta 25, 30 059 Kraków, Poland
autor
  • University of Zielona Góra, Szafrana 15, 65 516 Zielona Góra, Poland
  • AGH University of Science and Technology, A. Mickiewicza 30, 30-059 Kraków, Poland
  • Institute of Applied Mathematics and Mechanics, Rosa Luxemburg 74, 83-114 Donetsk, Ukraine
Bibliografia
  • [1] Hunt, J.D. (1984). Steady State Columnar and Equiaxed Growth of Dendrites and Eutectics. Materials Science and Engineering. 65, 75-83.
  • [2] Gu, J.P. & Beckermann, C. (1999). Simulation of Convection and Macro-Segregation in a Large Steel Ingot. Metallurgical and Materials Transactions. 30A, 1357-1366.
  • [3] Gandin, Ch.A. (2000). From Constrained to Unconstrained Growth during Directional Solidification. Acta Materialia. 48, 2483-2501.
  • [4] Gandin, Ch.A. (2000). Experimental Study of the Transition from Constrained to Unconstrained Growth during Directional Solidification. The Iron and Steel Institute of Japan-International. 40, 971-979.
  • [5] Wołczyński, W. (2010). Constrained / Unconstrained Solidification within the Massive Cast Steel / Iron Ingots. Archives of Foundry Engineering. 10(2), 195-202.
  • [6] Bogdan, O. (2010). Numerical Analysis of Casting Technology and A-Segregation Prediction in AISI 4340 Forgings Products. Industrial Soft. 1, 1-12.
  • [7] Wołczyński, W., Kania, B., Wajda, W. Kostrzewa, M. (2011). Space – Time – Structure Map for as Cast Massive Rolls. In Fundamentals of Heat and Mass Transfer – Computational Heat and Mass Transfer, Proceedings of the ASME/JSME 8-th Thermal Engineering Joint Conference – AJTEC, March 13-17, 2011. Conference CD: AJTEC-44021, 3.1. Honolulu, Hawaii, USA,; Hishida, K., Klausner, J., Satoh, I., Eds.; ASME/JSME.
  • [8] Szajnar, J. (2004).The Columnar Crystals Shape and Castings Structure Cast in Magnetic Field. Journal of Materials Processing Technology. 157/158, 761-764.
  • [9] Gandin, Ch.A., Mosbah, S., Volkmann, Th. & Herlach, D.M. (2008). Experimental and Numerical Modeling of Equiaxed Solidification in Metallic Alloys. Acta Materialia. 56, 3023-3035.
  • [10] McFadden, S., Browne, D.J. & Gandin, Ch.A. (2009). A Comparison of CET Prediction Methods using Simulation of the Growing Columnar Front. Metallurgical Transactions. 40A, 662-672.
  • [11] Konozsy, L., Ishmurzin, A., Grasser, M., Wu, M.H., Ludwig, A., Tanzer, R. & Schutzenhofer, W. (2010). Columnar to Equiaxed Transition during Ingot Casting using Ternary Alloy Composition. Materials Science Forum. 649, 349-354.
  • [12] Vusanović, I. & Voller, V.R. (2014). Understanding Channel Segregates in Numerical Models of Alloy Solidification: A Case of Converge First and Ask Questions Later. Materials Science Forum. 790/791, 73-78.
  • [13] Zimmermann, G., Sturz, L., Billia, B., Mangelinck-Noel, N., Liu, D.R. Nguyen Thi, H., Bergeon, N., Gandin, Ch.A., Browne, D.J., Beckermann, C., Tourret, D. & Karma, A. (2014). Columnar-to-Equiaxed Transition in Solidification Processing of AlSi7 Alloy in Microgravity -The CETSOL Project. Materials Science Forum. 790/791, 12-21.
  • [14] Wołczyński, W. (2016) Large Steel Ingots: Microstructure Mathematical Modeling, Entry in: The Encyclopedia of Iron, Steel, and Their Alloys, Ed. CRC Press, Taylor & Francis Group, Boca Raton, London, New York, Eds Rafael Colas, George E. Totten, v. III, Heat Treatment: Special – Molten, p. 1910-1924.
  • [15] Wołczyński, W., Guzik, E., Kania, B. & Wajda, W. (2010). Structure Fields in the Solidifying Cast Iron Roll. Archives of Foundry Engineering. 10(1), 41-46.
  • [16] Trepczyńska-Łent, M. (2013). Possibilities of the Materials Properties Improvement for the Cementite Eutectic by means of Unidirectional Solidification, Archives of Metallurgy and Materials. 58, 987-991.
  • [17] Majchrzak, E., Jasiński, M., & Kałuża, G. (2003). Sensitivity Analysis of Solidification with Respect to the Mold Thickness. Archives of Foundry. 3(9), 305-310.
  • [18] Ignaszak, Z., & Ciesiółka, J. (2004). Chosen identification problems of discontinuity in cast iron castings. Archives of Foundry. 4(14), 176-178. (in Polish).
  • [19] Ignaszak, Z., Popielarski, P., Hajkowski, J., & Codina, E. (2015). Methodology of Comparative Validation of Selected Foundry Simulation Process. Archives of Foundry Engineering. 15(4), 37-44.
Uwagi
PL
Opracowane ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-602e0d4e-73e1-4328-85f6-aa72c79a1c5d
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