Thermal Analysis of Solidification Process and Mechanical Properties in Heavy Section Ductile Iron Casting

Abstract:

A heavy section ductile casting (HSDIC) with dimensions of Φ590 mm×800 mm was prepared. Cooling curves at the center, at 85 mm from the center, at 170 mm from the center and at 255 mm from the center of the casting were recorded and analyzed. The results show that the precipitation of initial graphite, nucleation of eutectic cell and mass eutectic reaction at 255 mm from the center were all earlier than the other three locations. Moreover, it takes the longest time of 53 minutes of recalescence at 170 mm from the center with the highest temperature rise of 7 °C, though the cooling rate at this location is not the lowest in the casting, the mechanical properties are the worst. In addition, the largest amount of chunky graphite appears at 170 mm from the center.

• Periodical: Advanced Materials Research (Volumes 750-752)
• Pages: 454-461
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.750-752.454
• Online since: August 2013
• Authors: Wei Ping Chen, Li Wei Zhou, Wen Hui Li, Zhe Liu
• Keywords: Heavy Section Ductile Iron, Solidification Process, Thermal Analysis

References

[1] M. D. Chaudhari, R. W. Heine, C. R. Loper Jr, Principles involved in the use of cooling curves in ductile iron process control, AFS Transactions. 82 (1974) 431.

[2] P. Larrañaga, J. Sertucha, R. Suárez, Análisis del proceso de solidificación en fundiciones grafíticas esferoidales, Revista de metalurgia. 42 (2006) 244-255.

DOI: 10.3989/revmetalm.2006.v42.i4.24

[3] J. Sertucha, R. Suárez, J. Izaga, L. A. Hurtado J. Legazpi, Prediction of solid state structure based on eutectic and eutectoid transformation parameters in spheroidal graphite irons, Int J Cast Metal Res. 19 (2006) 315.

DOI: 10.1179/136404606x167114

[4] Z. Ignaszak, Nodular graphite degeneration in the post-inoculated ductile iron, Int J Cast Metal Res. 16 (2003) 93-97.

DOI: 10.1080/13640461.2003.11819565

[5] R. Doepp S. Schwenkel, Contribution to the influence of chemical composition and cooling conditions on the eutectic solidification range of Fe–C–X-melts, Mater. Sci. Eng. A. 413 (2005) 334-338.

DOI: 10.1016/j.msea.2005.08.213

[6] A. Suárez-Sanabria, J. Fernández-Carrasquilla, Microestructura y propiedades mecánicas de una fundición esferoidal ferrítica en bruto de colada para su uso en piezas de grandes dimensiones, Rev Metal Madrid. 42 (2006) 18-31.

DOI: 10.3989/revmetalm.2006.v42.i1.3

[7] R. Källbom, K. Hamberg, M. Wessén, L. E. Björkegren, On the solidification sequence of ductile iron castings containing chunky graphite, Mater. Sci. Eng. A. 413 (2005) 346-351.

DOI: 10.1016/j.msea.2005.08.210

[8] R. Källbom, K. Hamberg, L. E. Björkegren, Chunky Graphite in Ductile Iron Castings, presented at World Foundry Congress Harrogate England. 01-01-(2005).

DOI: 10.1016/j.msea.2005.08.210

[9] T. C. Xi, J. Fargues, M. Hecht, J. C. Margerie, Formation and prevention of chunky graphite in slowly cooled nodular irons, Physical Metallurgy of Cast Iron. 34 (1985) 67-76.

DOI: 10.1557/proc-34-67

[10] M. Wessén, I. L. Svensson, R. Aagaard, Influence of antimony on microstructure and mechanical properties in thick-walled ductile iron castings, Int J Cast Metal Res. 16 (2003) 119-124.

DOI: 10.1080/13640461.2003.11819569

[11] R. K. Buhr, Vermiculite Graphite Formation in Heavy Section Nodular Iron Castings, Mod Cast. 54 (1968) 497.

[12] Z. H. Li, Y. X. Li, Evaluation of melt quality and graphite degeneration prediction in heavy section ductile iron, Metall Mater Trans A. 36A (2005) 2455-2460.

DOI: 10.1007/s11661-005-0119-y

[13] H. Itofuji, A. Masutani, Nucleation and growth behaviour of chunky graphite, Int. J. Cast Met. Res. 14 (2001) 1-14.

DOI: 10.1080/13640461.2001.11819419

[14] I. Asenjo, P. Larranaga, J. Sertucha, R. Suarez, J. M. Gomez, I. Ferrer, J. Lacaze, Effect of mould inoculation on formation of chunky graphite in heavy section spheroidal graphite cast iron parts, Int J Cast Metal Res. 20 (2007) 319-324.

DOI: 10.1179/136404608x286138

[15] J. Sertucha, A. Su, R. O. Rez, N, I. Asenjo, N. Larra, P. Aga, J. Lacaze, I. N. Ferrer, Aki, S. Armendariz, Thermal Analysis of the Formation of Chunky Graphite during Solidification of Heavy-section Spheroidal Graphite Iron Parts, Isij Int. 49 (2009).

DOI: 10.2355/isijinternational.49.220