The Oxidation of the HiSiMo Cast Irons Alloyed with Cr/Al at 800 °C


To improve the oxidation resistance of cast iron containing Si and Mo (HiSiMo), 1wt.% Cr and 3wt.% Al were added into the base alloy to improve high temperature oxidation resistance for exhaust manifold applications. Oxidation tests were performed in both dry and wet air (air + 10% H2O) at 800 °C for 1, 10, 24, and 50 h. The mass change and oxide thickness were measured to evaluate the oxidation resistance. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDS) and transmission electron microscopy (TEM) were employed to characterize the oxidized samples. The results showed that the additions of Al or Cr selectively oxidized to form a more oxidation resistant surface oxide layer, which reduced the mass gain during these experiments.


Materials Science and Engineering


The authors would like to thank the financial support by the US Department of Energy, Office of Energy Efficiency and Renewable Energy (Vehicle Technologies Office, Propulsion Materials Program) under Award No. DE-EE0008458.

Keywords and Phrases

Cast iron; HiSiMo; Oxidation; TEM

International Standard Serial Number (ISSN)

1573-4889; 0030-770X

Document Type

Article - Journal

Document Version


File Type





© 2022 Springer, All rights reserved.

Publication Date

04 Mar 2022