Effect of Cooling Rate and Aluminium Addition on Graphite Growth during Solidification and Graphitization

Jacques Bourdie; Fabien Bruneseaux; Philippe de Parseval; Sophie Gouy; Lydia Laffont; Jacques Lacaze

doi:10.4028/www.scientific.net/MSF.925.20

Paper Titles

Preface

The Role of Compounds in Graphite Formation in Cast Iron - A Review
p.3

Effect of Cooling Rate on the Eutectoid Transformation in Compacted Graphite Cast Iron
p.12

Effect of Cooling Rate and Aluminium Addition on Graphite Growth during Solidification and Graphitization
p.20

Evolution of Shrinkage with Carbon Equivalent and Inoculation in Ductile Cast Irons
p.28

Reassessment of Crystal Growth Theory of Graphite in Cast Iron
p.36

Effect of the Cooling Rate on the Graphite Nodule Count and Size Distribution in Nodular Cast Iron
p.45

Crystallography of Growth Blocks in Spheroidal Graphite
p.54

Degenerated Graphite Growth in Ductile Iron
p.62

HomeMaterials Science ForumMaterials Science Forum Vol. 925Effect of Cooling Rate and Aluminium Addition on...

Effect of Cooling Rate and Aluminium Addition on Graphite Growth during Solidification and Graphitization

Abstract:

Even using high inoculation levels, mottled structures are often obtained when casting Mg-treated cast irons in thin wall parts. For full graphitization of the cast components, this calls for a subsequent heat-treatment which is generally achieved in the austenite field. The aim of this work was investigating the impact of the process and the cooling rate on the graphite structure for two different casting conditions. The influence of the cooling rate on graphite degeneracy due to the presence of impurity was also investigated considering low-level additions of aluminium. Extensive metallographic investigation has been carried out from which it is concluded that the internal graphite structure is the same for the two studied cooling conditions. Accordingly, the growth mechanism of graphite should be the same when it precipitates from liquid, during eutectic reaction or else solid-state graphitization. Finally, microanalyses suggest magnesium and aluminium do not interact in the same way with graphite during its growth.

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Periodical:

Materials Science Forum (Volume 925)

Pages:

20-27

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.925.20

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Online since:

June 2018

Authors:

Jacques Bourdie*, Fabien Bruneseaux, Philippe de Parseval, Sophie Gouy, Lydia Laffont, Jacques Lacaze

Keywords:

Aluminium, Cooling Rate, Degeneracy, Graphite Growth, Magnesium, Spheroidal Graphite

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* - Corresponding Author

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