Structural Characteristics of Ductile Iron at Different Rare Earth Contribution from a Magnesium Ferrosilicon Alloy

Valentin Uta; Iulian Riposan

doi:10.4028/www.scientific.net/SSP.216.17

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Structural Characteristics of Ductile Iron at Different Rare Earth Contribution from a Magnesium Ferrosilicon Alloy

Abstract:

The structural characteristics of ductile irons were studied using different rare earth elements (REE) in Mg-FeSi treatment alloys (0.005 - 0.025%REE_res), in un-inoculated and Ca-bearing FeSi in the mould inoculated irons. In relatively high purity base iron, in terms of anti-nodularising trace elements, (Thielman factor K = 0.7-0.8), increasing REE content after Mg-treatment aggravated the carbides tendency and decreased the nodular graphite compactness, in both un-inoculated and inoculated irons. Graphite parameters improve for lower REE content, and, in both cases, for inoculated irons. A low content of REE_res(0.005 to 0.01%) for K < 0.8 is practical and sufficient in a Ca-bearing FeSi alloys inoculated iron to control carbides sensitivity and to sustain acceptable nodular graphite morphology formation.

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Periodical:

Solid State Phenomena (Volume 216)

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17-22

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https://doi.org/10.4028/www.scientific.net/SSP.216.17

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Online since:

August 2014

Authors:

Valentin Uta, Iulian Riposan*

Keywords:

Carbide, Ductile Iron, Graphite, Inoculation, Magnesium, Rare Earth, Structure

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