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On the solidification of nodular cast iron and its relation to the expansion and contraction
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing.
2005 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 413, 363-372 p.Article in journal (Refereed) Published
Abstract [en]

Directional solidification and quench-out thermal analysis experiments have been performed in Mg-treated cast iron alloys. The volume fraction of liquid, allstenite and graphite was evaluated. It was observed that the volume fraction of austenite is much larger than expected from the equilibrium phase diagram at the beginning of the solidification process. It was also been observed that the last melt solidifies far below the equilibrium eutectic temperature. The solidification process was analyzed by non-equilibrium thermodynamic models. The theoretical treatment was supported by the observation that the latent heat decreases during the solidification process. The formation of small pores was observed at the very end of the solidification. An explanation for the formation of the small pores is given in terms of a vacancies creep model. The formation of macropores was related to the large fraction of austenite formed during the first part of the solidification process.

Place, publisher, year, edition, pages
2005. Vol. 413, 363-372 p.
Keyword [en]
cast iron, nodular, shrinkage, solidification, metastable, thermodynamics
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-15277DOI: 10.1016/j.msea.2005.09.028ISI: 000234202900059Scopus ID: 2-s2.0-29444456067OAI: oai:DiVA.org:kth-15277DiVA: diva2:333318
Note

QC 20100525 QC 20111012

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2016-12-21Bibliographically approved

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