Oxidation of Oxide Dispersion Strengthened Steels: II. Kinetics and Mechanism

Abstract:

The oxidation resistance of 18%Cr-oxide dispersion strengthened (ODS) ferritic steels with and without 5%Al has been investigated in air at 700900 °C for time period up to 540 h. The oxidation rate of ODS steels is significantly dependent on the oxidation time and temperature. Compared to Al-containing ODS steel, the finer grains of Al-free ODS steel are due to the formation of smaller coherent oxide particles which suppress the steel's grain growth. The grain refinement of ODS steels is expected to allow rapid segregation of Cr or Al to the steel surface, so that the continuous Fe-Cr spinel or alumina layer is formed quickly in comparison to the alloys without oxide particles dispersion. Therefore, the excellent oxidation resistance of ODS steels is owing to the formation of continuous, protective oxide layers which correlate with oxide nanoparticles and grain refinement.

• Periodical: Advanced Materials Research (Volume 748)
• Pages: 106-111
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.748.106
• Online since: August 2013
• Authors: Jae Hoon Lee
• Keywords: Mechanism, Oxidation, Oxide Dispersion Strengthened (ODS), Temperature, Time

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