Oxidation Behavior of Fe<sub>3</sub>Al-5Cr- (0, 0.5, 1.5) Ti Alloys at Temperature Ranges from 800℃ to 1200 ℃
- 1 Researcher, Steel Technology Department, Central Metallurgical R&D Institute (CMRDI),P. O. Box 87 Helwan, Egypt
Abstract
As cast Fe 3 Al-5Cr- (0, 0.5, 1.5) Ti alloys were isothermally oxidized at temperature ranges from 800 to 1200 ℃ in air, and their oxidation characteristics were studied using thermogravimetric analyzer, X-ray diffractometer, optical microscope and scanning electron microscope. It was found that Ti increased the oxidation resistance of Fe 3 Al- Cr alloys to a certain extent. The oxide scales that formed on the unalloyed Fe 3 Al alloys consisted primarily of α-Al 2 O 3 containing a small percentage of dissolved iron and chromium ions. The experimental result of unalloyed Fe 3 Al alloy shows also, an Al-free, Fe-enriched zone was formed beneath the oxide scale, owing to Al consumption to form the oxide scale. The oxide scale on unalloyed Fe 3 Al alloy had poor adherence. On the other hand, the result shows that, the oxidation rate decreased for titanium alloyed Fe 3 Al alloy, which has been explained by a change in the nature of the surface scale. Analysis of the oxidation product revealed that the presence of titanium as alloying elements change the nature of formed oxide scale and protect the bulk alloy from further oxidation.
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