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High-Temperature Oxidation of a High Silicon SiMo Spheroidal Cast Iron in Air with <i>In Situ</i> Change in H<sub>2</sub>O Content

Ebel, André and Brou, Serge Yapi and Malard, Benoît and Lacaze, Jacques and Monceau, Daniel and Vaissière, Loïc High-Temperature Oxidation of a High Silicon SiMo Spheroidal Cast Iron in Air with <i>In Situ</i> Change in H<sub>2</sub>O Content. (2018) Materials Science Forum, 925. 353-360. ISSN 1662-9752

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Official URL: https://doi.org/10.4028/www.scientific.net/MSF.925.353

Abstract

Exhaust manifolds for diesel engines are made of high-Si ferritic nodular cast irons. It is experimentally well established that their oxidation kinetics are highly sensitive to the presence of water vapor, though the mechanism for such an effect is still controversial. In the present work, isothermal oxidation tests were performed on a SiMo nodular cast iron at 700 °C and 800 °C in dry and humid air for 25 and 50 hours. Other samples were oxidized for 50 h with in-situ change in H2O content after 25 h, switching from dry air to humid air or the other way around. Samples were then analyzed using XRD, SEM-EDS and Raman spectroscopy. Thermogravimetric records clearly showed the effect of temperature and environment on oxidation and decarburization. The kinetics of these phenomena depend on silica formation at the metal-oxide interface. At both temperatures,water vapor was seen to promote internal oxidation of Si instead of its external oxidation. This leads to higher oxidation rate at 700°C and higher decarburization rate at 800 °C.

Item Type:Article
HAL Id:hal-02059435
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Renault SAS (FRANCE)
Other partners > Université Félix Houphouët-Boigny - UFHB (IVORY COAST)
Laboratory name:
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Deposited By: cirimat webmestre
Deposited On:06 Mar 2019 14:47

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