| Autor: |
Sikka, V.K., Wilkening, D., Liebetrau, J., Mackey, B. |
| Zdroj: |
Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing; December 1998, Vol. 258 Issue: 1-2 p229-235, 7p |
| Abstrakt: |
The FeAl-based intermetallic alloys are of great interest because of their low density, low raw material cost, and excellent resistance to high-temperature oxidation, sulfidation, carburization, and molten salts. The applications based on these unique properties of FeAl require methods to melt and cast these alloys into complex-shaped castings and centrifugal cast tubes. This paper addresses the melting-related issues and the effect of chemistry on the microstructure and hardness of castings. It is concluded that the use of the Exo-Melt™ process for melting and the proper selection of the aluminum melt stock can result in porosity-free castings. The FeAl alloys can be melted and cast from the virgin and revert stock. A large variation in carbon content of the alloys is possible before the precipitation of graphite flakes occurs. Titanium is a very potent addition to refine the grain size of castings. A range of complex sand castings and two different sizes of centrifugal cast tubes of the alloy have already been cast. |
| Databáze: |
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