ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
Regular Article
Improved Analytical Method for Chemical Analysis of Cast Irons Application to Castings with Chunky Graphite
Susana MendezDavid LopezIker AsenjoPello LarranagaJacques Lacaze
Author information
JOURNALS FREE ACCESS

Volume 51 (2011) Issue 2 Pages 242-249

Details
Download PDF (1691K) Contact us
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, ···.

Information related to the author
© 2011 by The Iron and Steel Institute of Japan
Previous article Next article

Recently visited articles
feedback
Top