| Issue |
Matériaux & Techniques
Volume 69, Number 6-7, 1981
|
|
|---|---|---|
| Page(s) | 199 - 204 | |
| DOI | https://doi.org/10.1051/mattech/198169060199 | |
| Published online | 19 April 2017 | |
Contribution à l’étude des fontes malléables traitées au magnésium
Contribution to the study of malleable cast-iron treated with magnesium
1 Ecole Nationale Supérieure d’Arts et Métiers de Paris - Laboratoire de métallurgie
2 Fonderies Peugeot, Usine de Sept-Fons.
Abstract
The addition of magnesium to a melren cast-iron, with equivalent carbon percentage of about 3.7, prevents eutectic graphitization. The carbides produced at solidification disappear during the malleabilization treatment. The intense carbon cristallization reduces the duration of the thermal cycle.
The study of the f irst stage of graphitization, which depends on basic alloy elements, gives precisely the chemical composition supplying optimum elaboration : it is found between that of usual malleable and spheroidal-graphite cast-irons.
A comparison between the properties of these three kinds of cast-irons shows the interesting characteristics of this new material. For the same hardness, the tensile strengths and fatigue limit are increased, as well as the machinability. Better foundry properties is one of the advantages which could justify an industrial development for this alloy.
© SIRPE 1981
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