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Metals 2017, 7(7), 244; doi:10.3390/met7070244

Investigation of Dendrite Coarsening in Complex Shaped Lamellar Graphite Iron Castings

1
Department of Materials and Manufacturing—Foundry Technology, Jönköping University, 551 11 Jönköping, Sweden
2
Department of Material Science and Engineering, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden
*
Author to whom correspondence should be addressed.
Received: 31 May 2017 / Revised: 28 June 2017 / Accepted: 29 June 2017 / Published: 1 July 2017
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Abstract

Shrinkage porosity and metal expansion penetration are two casting defects that appear frequently during the production of complex-shaped lamellar graphite iron components. These casting defects are formed during the solidification and usually form in the part of the casting which solidifies last. The position of the area that solidifies last is dependent on the thermal conditions. Test castings with thermal conditions like those existing in a complex-shaped casting were successfully applied to provoke a shrinkage porosity defect and a metal expansion penetration defect. The investigation of the primary dendrite morphology in the defected positions indicates a maximum intradendritic space, where the shrinkage porosity and metal expansion penetration defects appear. Moving away from the defect formation area, the intradendritic space decreases. A comparison of the intradendritic space with the simulated local solidification times indicates a strong relationship, which can be explained by the dynamic coarsening process. More specifically, long local solidification times facilitates the formation of a locally coarsened austenite morphology. This, in turn, enables the formation of a shrinkage porosity or a metal expansion penetration. View Full-Text
Keywords: lamellar cast iron; primary austenite; dendrite morphology; coarsening; shrinkage porosity (SP); metal expansion penetration (MEP) lamellar cast iron; primary austenite; dendrite morphology; coarsening; shrinkage porosity (SP); metal expansion penetration (MEP)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Svidró, P.; Diószegi, A.; Pour, M.S.; Jönsson, P. Investigation of Dendrite Coarsening in Complex Shaped Lamellar Graphite Iron Castings. Metals 2017, 7, 244.

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