Oxidation Behavior of Fe₃Al-5Cr- (0, 0.5, 1.5) Ti Alloys at Temperature Ranges from 800℃ to 1200 ℃

Hossam Halfa

Researcher, Steel Technology Department, Central Metallurgical R&D Institute (CMRDI),P. O. Box 87 Helwan, Egypt.

DOI: 10.4236/jmmce.2010.99055                

Abstract

As cast Fe₃Al-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 Fe₃Al- Cr alloys to a certain extent. The oxide scales that formed on the unalloyed Fe₃Al alloys consisted primarily of α-Al₂O₃ containing a small percentage of dissolved iron and chromium ions. The experimental result of unalloyed Fe₃Al 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 Fe₃Al alloy had poor adherence. On the other hand, the result shows that, the oxidation rate decreased for titanium alloyed Fe₃Al 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.

Keywords

Intermetallic, compound, Fe₃Al, scale, oxidation resistance, High temperature

Conflicts of Interest

The authors declare no conflicts of interest.

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