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Improved analytical method for chemical analysis of cast irons. Application to castings with chunky graphite

Mendez, Susana and Lopez, David and Asenjo, Iker and Larrañaga, Peio and Lacaze, Jacques Improved analytical method for chemical analysis of cast irons. Application to castings with chunky graphite. (2011) ISIJ International, vol. 51 (n° 2). pp. 242-249. ISSN 0915-1559

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Official URL: https://www.jstage.jst.go.jp/article/isijinternational/51/2/51_2_242/_article

Abstract

Chunky graphite is a particular form of graphite degeneracy that appears in the centre of large iron castings, with a well-defined transition from the outer unaffected area and the inner affected one. All previous works that looked for macrosegration to explain the phenomenon concluded that there are no significant composition differences between the inner and outer parts of such castings. This was challenged again because the analytical methods generally used for chemical analysis are not efficient for low-level elements. Accordingly, an ICP-MS procedure has been developed and validated to replace the usual ICP-OES method. Together with the usual methods for analysis of C, S and Si, this ICP-MS procedure has been applied to characterize chemical heterogeneities in a large block with chunky graphite in its centre, and to a standard part for comparison. It could be concluded that no macrosegregation has built up during the solidification process of the block investigated, i.e. that chunky graphite appearance is not related to any composition changes at the scale of the cast parts, in particular of elements known to affect graphite shape such as Ce, Mg, Sb, S,…

Item Type:Article
Additional Information:Thanks to Iron and Steel Institute of Japan Journal. The original version is available at https://www.jstage.jst.go.jp/browse/isijinternational. The original PDF of the article can be found at ISIJ International website: https://www.jstage.jst.go.jp/article/isijinternational/51/2/51_2_242/_article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > IK4 - Azterlan - Centro de Investigación Metalúrgica (SPAIN)
French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Laboratory name:
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Deposited By: Denis Faragou

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