High Temperature Applications of Iron-Aluminum Alloys Exposed to Sulfur Gases

Abstract

Iron-Aluminum alloys are one of the most resistant alloys against sulfidation/oxidation environments with low oxygen partial pressures. The high sensitivity to hydrogen embrittlement is the main reason for decreasing of their room temperature ductility. There is a drop of strength above 600 C and their creep resistance is fairly weak. It is possible to increase ductility up to 15 percents and improve creep resistance as well as ferritic and austenitic steels through microstructure control and alloy elements. The use of these alloys as diffusion coating is a good alternative to access simultaneously of excellent sulfidation and good mechanical properties in high temperature. In this paper, firstly, the environmental embrittlement and room & high temperature mechanical properties of these alloys are evaluated and then, their sulfidation resistance and the effective factors are explained. Moreover the paper points to usage of them as diffusion coatings.

 
 
 

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