Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7922468 | Materials Chemistry and Physics | 2018 | 36 Pages |
Abstract
In this study, the effect of alloying elements, cerium (Ce) and tungsten (W), on the oxidation behavior of medium chromium ferritic stainless steel in simulated automotive exhaust gases containing 5 vol.% H2O was studied in the temperature range of 950-1100 °C for 5 h. The oxidation kinetics and oxide film characteristics were analyzed by means of thermo-gravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscope (SEM) and elemental probe micro-analyzer (EPMA). The growth rate of oxidation and oxidation mass gain were significantly decreased on the addition of Ce. A dense, uniform, and thin oxide scale formed on Ce-containing steels. The steel containing Ce and â¼0.5 wt% W displayed similar oxidation behavior compared to the steel containing only Ce. A large number of cracks and pores existed in the oxide film and oxide/metal interface leading to the spallation of oxide film, when the addition of W reached â¼1.0 wt%.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
L.L. Wei, L.Q. Chen, M.Y. Ma, H.L. Liu, R.D.K. Misra,