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On the Formation of Micro-Shrinkage Porosities in Ductile Iron Cast Components
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0002-7527-719X
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0002-0101-0062
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0002-3024-9005
2018 (English)In: Metals, E-ISSN 2075-4701, Vol. 8, no 7, article id 551Article in journal (Refereed) Published
Abstract [en]

A combination of direct austempering after solidification (DAAS) treatment and electron backscatter diffraction (EBSD) method was used to study the formation of micro-shrinkage porosities in ductile iron. Analyzing the aus-ferritic microstructure revealed that most of micro-shrinkage porosities are formed at the retained austenite grain boundaries. There was no obvious correlation between the ferrite grains or graphite nodules and micro-shrinkage porosities. Due to the absolute pressure change at the (purely) shrinkage porosities, the dendrite fragmentation rate during the DAAS process would be altered locally, which caused a relatively finer parent-austenite grain structure near such porosities.

Place, publisher, year, edition, pages
MDPI, 2018. Vol. 8, no 7, article id 551
Keywords [en]
DAAS, EBSD, shrinkage porosity, austenite, graphite, nodule
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-41066DOI: 10.3390/met8070551ISI: 000445096800081Scopus ID: 2-s2.0-85050550978OAI: oai:DiVA.org:hj-41066DiVA, id: diva2:1235452
Available from: 2018-07-25 Created: 2018-07-25 Last updated: 2019-02-14Bibliographically approved

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Ghassemali, EhsanJarfors, Anders E.W.Diószegi, Attila

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