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

• Published in: Oxidation of metals Vol. 97; no. 3-4; pp. 441 - 449
• Main Authors: Zhu, Wenhui, Pint, Bruce A., Huo, Yang, Godlewski, Larry, Ghaffari, Bita, Lekakh, Simon, Engler-Pinto, Carlos, Li, Mei
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.04.2022; Springer Nature B.V; Springer
• Subjects: Alloy cast iron; Alloying; Aluminum; cast iron; Chemistry and Materials Science; Chromium; Corrosion and Coatings; Electron microscopy; Heat resistant alloys; High temperature; HiSiMo; Inorganic Chemistry; MATERIALS SCIENCE; Metallic Materials; Microscopy; Molybdenum; Original Paper; Oxidation; Oxidation resistance; Oxidation tests; Silicon; TEM; Thickness measurement; Tribology; HiSiMo; Oxidation; TEM; Cast iron
• ISSN: 0030-770X; 1573-4889
• DOI: 10.1007/s11085-022-10098-3

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% H 2 O) 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.