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Microstructure and Mechanical Properties of Continuous Cast Ductile Iron  

Choe, Kyeong-Hwan (Korea Institute of Industrial Technology)
Cho, Gue-Serb (Korea Institute of Industrial Technology)
Lee, Kyong-Whoan (Korea Institute of Industrial Technology)
Kim, Ki-Yeong (Korea University of Technology and Education)
Publication Information
Journal of Korea Foundry Society / v.24, no.1, 2004 , pp. 52-59 More about this Journal
Abstract
Microstructure and mechanical properties of ductile cast iron were investigated in terms of diameter change of samples that gives rise to modify the microstructure due to different cooling rate in the continuous casting process. The chemical composition used in this study was GCD 400 grade. From the microstructural observation, we have found a large number of graphite with small size in diameter which is comparable to the microstructure of the sample produced by conventional sand casting. The major reason of this would he due to high cooling rate. In the sample with 26 mm in diameter, the microstructure was composed of pearlite, iron carbide, and graphite. In the samples with 60 and 100 mm in diameter, however, we have observed a dissimilar microstructure that consisting of ferrite and graphite. Concerning the mechanical property, the sample with 26 mm in diameter showed higher hardness and strength compared to those samples with 60 and 100 mm in diameter. The result obtained for ductility appeared a reversal. Much more works such as inoculation, process design and chemical composition would be required in order to have a sound product even in a small diameter of samples.
Keywords
continuous casting; ductile cast iron; graphite; cooling rate;
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  • Reference
1 Japan Foundrymen's Society : 'Case Iron Handbook', (1999), 1571-1587
2 ASM International: 'ASM Specialty Handbook: Cast irons', (1996), 66
3 G. S. Cole: AFS Trans., 'Solidification of Ductile Iron', 80 (1972),335-348
4 C. R. Loper, Jr. and R. W. Heine: AFS Trans., 'Dendritic structure and spiking in ductile iron', 76 (1968),547-554
5 Japan Foundrymen's Society: 'Permanent mold Casting N of Cast Iron', (1976), 109-110
6 C. R. Loper, Jr., R. W. Heine, R. W. Reesman and B. H. Shah: AFS Trans., "Thermal analysis of ductile iron', 75 (1967),541-547
7 S. Y Kim, J. H. Hong, C. S. Kang and H. Y Ra: 'Ca'ie Iron Engineering', (1996) 257
8 T. W. Parks and C. R. Loper, Jr.: AFS Trans., 'A study of the conditions promoting dendritic growth in ductile iron', 77 (1969),90-96
9 Y Osafune and Y Tanaka: Journal of JFS, 'Grain Refinement and Tensile Properties of Ferritic Spheroidal Graphite Cast Iron', 69(4) (1997), 309-315