Oxidation of Oxide Dispersion Strengthened Steels: I. Influence of Alloy Composition

Abstract:

Oxidation tests of 18%Cr-oxide dispersion strengthened (ODS) steels with and without 5%Al were carried out in air at 700900 °C for time period up to 540 h. No minor alloying elements affect the oxidation behavior and the Al concentration between these ODS steels is a main difference. Cr₂O₃ and (Fe,Cr)₃O₄ spinel oxides exist on the surface of 18Cr-ODS steel; however, the surface oxide of 18Cr5Al-ODS steel is comprised of only Al₂O₃. Oxidation resistance of the ODS steels exposed at 700 °C is much better than Incoloy800 of which the Cr content is larger and their oxidation behavior doesnt follow the aluminum content. These results suggest that oxide particles dispersion and grain refinement play a more critical role than alloy composition in the high-temperature oxidation resistance.

• Periodical: Advanced Materials Research (Volume 748)
• Pages: 86-90
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.748.86
• Online since: August 2013
• Authors: Jae Hoon Lee
• Keywords: Composition, Oxidation, Oxide Dispersion Strengthened (ODS), Temperature

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