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Investigation of dendrite coarsening in complex shaped lamellar graphite iron castings
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting. Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0001-7012-9342
Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.ORCID iD: 0000-0002-3024-9005
Department of Material Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden.
Department of Material Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden.
2017 (English)In: Metals, ISSN 2075-4701, Vol. 7, no 7, 244Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
MDPI , 2017. Vol. 7, no 7, 244
Keyword [en]
Coarsening, Dendrite morphology, Lamellar cast iron, Metal expansion penetration (MEP), Primary austenite, Shrinkage porosity (SP)
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-37108DOI: 10.3390/met7070244ISI: 000407365900015Scopus ID: 2-s2.0-85022339105OAI: oai:DiVA.org:hj-37108DiVA: diva2:1137641
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Knowledge Foundation
Available from: 2017-08-31 Created: 2017-08-31 Last updated: 2017-08-31Bibliographically approved

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Svidró, PéterDiószegi, Attila

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