MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Microstructural Characteristics of Electric Discharge Alloyed Layers on Spheroidal Graphite Cast Iron with Different Electrode Materials
Hung-Mao LinTruan-Sheng Lui
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2012 Volume 53 Issue 6 Pages 1184-1190

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Abstract

In this study, electrical discharge alloying (EDA) is used to modify the surface of ferritic spheroidal graphite cast iron. Under the conditions of fixed EDA parameters and variable elements (i.e., electrode materials Fe–75 mass%Si, Al, Ni, Mg and Cr), these alloying elements are dissolved in substrate. Then, the effects of alloying with different alloying elements on the EDAed layers are investigated. Experimental results reveal that the Mg electrode has produced the thickest EDAed layer while the Cr electrode has produced a thinner layer. Additionally, EPMA/mapping is also used to analyze the distribution of different elements in their respective EDAed layers and X-ray diffraction is used to analyze the phase compositions of these layers. The results of hardness tests reveal that the EDAed layer with Cr has the highest hardness value. This may be related to the formation of carbides that contain Cr in the layer.

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© 2012 The Japan Institute of Metals and Materials
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