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Journal Articles Corrosion Science Year : 2021

Cyclic oxidation of high-silicon spheroidal graphite iron

Abstract

In service, automotive exhaust manifolds are submitted to rapid thermal cycling up to 700–750 °C. To simulate an increase in exhaust gas temperature, a high-silicon cast iron was tested for rapid thermal cycling up to 800 °C. In addition to the well-known duplex oxide scale, rapid cyclic oxidation promotes the formation of a columnar zone at the substrate/oxide interface that has never been reported. It is evidenced that this columnar zone proceeds from a repetitive process. Based on detailed metallographic analysis using optical observations, in-situ XRD, micro-analyses and Raman spectroscopy, a mechanism explaining the formation of this columnar zone is proposed.
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Dates and versions

hal-03362964 , version 1 (02-10-2021)

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André Ebel, Olivier Marsan, Jacques Lacaze, Benoit Malard. Cyclic oxidation of high-silicon spheroidal graphite iron. Corrosion Science, 2021, 192, pp.109854. ⟨10.1016/j.corsci.2021.109854⟩. ⟨hal-03362964⟩
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