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The effects of carbon on the solidification of nodular cast iron- its study with the help of linear variable differential transformer and microstructural analysis
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-7474-2053
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0003-2449-9232
2018 (English)In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 31, no 2, p. 108-117Article in journal (Refereed) Published
Abstract [en]

The effect of carbon on the solidification of ductile cast iron (DCI) was studied using linear variable differential transducers (LVDT) and microstructural analysis. Thermal expansion during the eutectic solidification was investigated by using LVDT and temperature measurements. The eutectic volume change was compared with the theoretical calculation. Furthermore, the primary austenite during solidification was evaluated by using differential thermal analysis and the samples undergo a dilatometer experimentation to assess the effect of cooling rates. It was found that the samples show no expansion in the transversal direction due to higher micro-shrinkages in the centre whereas in the longitudinal direction the samples shows expansion until solidification completed. The theoretical and measured volume changes agree with each other. The austenite fraction and micro-shrinkage pores decrease with increase in carbon content. The nodule count and distribution changes with carbon content. The thermal contraction of DCI is not influenced by carbon content variation at lower cooling rate.

Place, publisher, year, edition, pages
Taylor & Francis, 2018. Vol. 31, no 2, p. 108-117
Keywords [en]
Solidification, DCI, LVDT, austenite, DTA, dilatometer, micro-shrinkage pores
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-240254DOI: 10.1080/13640461.2017.1377382ISI: 000428583600007Scopus ID: 2-s2.0-85029524980OAI: oai:DiVA.org:kth-240254DiVA, id: diva2:1270434
Note

QC 20181213

Available from: 2018-12-13 Created: 2018-12-13 Last updated: 2018-12-13Bibliographically approved

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Tadesse, AbelFredriksson, Hasse

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