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On the relation between primary and eutectic solidification structures in gray iron
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
2012 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The solidification of hypoeutectic gray cast iron starts with the nucleation of primary austenite crystals. Before graphite is nucleated, and the eutectic structure is formed, these crystals start to grow as columnar or equiaxed dendrites. However, very little is known about these dendrites, and especially how they influence the subsequent eutectic structure. Besides, it has previously been shown that the primary solidification structure influences the formation of defects. Shrinkage porosity was found between the dendrites, in the grain boundaries, and the formation of the primary solidification structure was found to influence problems related to metal expansion penetration. Therefore a better understanding about the formation of this structure is of importance. In this work, different inoculants and their influence on the formation of the micro- and macrostructures has been investigated. The inoculants considered are commercially used inoculants, i.e. inoculants used in the foundries, as well as different iron powders. The addition of iron powder is used to promote the primary solidification structure. It is shown that the nucleation of the dendrites is influenced by the amount of iron powder. Secondary dendrite arm spacing is a quantitative measurement in the microstructure related to these dendrites, which in turn depends on the solidification time. Eutectic cell size, on the other hand, is found to depend on secondary dendrite arm spacing. It is shown how the addition of inoculants influences both primary and eutectic solidification structures, and how they are related to each other.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2012. Vol. 27, no 1
Series
IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X ; 27
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hj:diva-23077DOI: 10.1088/1757-899X/27/1/012060ISI: 000301192900060OAI: oai:DiVA.org:hj-23077DiVA, id: diva2:687054
Conference
The 3rd International Conference on Advances in Solidification Processes, 7–10 June 2011, Rolduc Abbey, Aachen, The Netherlands
Available from: 2014-01-13 Created: 2014-01-13 Last updated: 2018-09-14Bibliographically approved

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Elmquist, Lennart

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  • apa
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