<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>This paper presents the results of investigation of four cast alloys based on the Fe3Al intermetallic phase. Microstructure tests using light microscopy, electron scanning microscopy and X-ray diffraction methods, have been performed. On this basis, a presence of particles rich in zirconium and molybdenum, and in case of the alloy with 28 at.% aluminium and 5 at.% chromium — the presence of sigma phase (FeCr), has been found. Also, the results of the study of the microstructure influence on the electrochemical corrosion resistance in the 5 % NaCl solution have been presented. The Fe-26Al-2Cr-1Mo-0.1Zr-0.005B at.% and Fe-26Al-5Cr-1Mo-0.1Zr-0.005B at.% alloys exhibited increased corrosion resistance in comparison to the Fe-23Al-1Mo-0.1Zr-0.005B at.% alloy without chromium addition. The appearance of the sigma phase in the alloy of Fe-28Al-5Cr-1Mo-0.1Zr-0.005B at.% chemical composition resulted in lowering the corrosion resistance of this alloy and a change in corrosion character from the pitting to the intercrystalline one.</p></abstract>

This paper presents the results of investigation of four cast alloys based on the Fe3Al intermetallic phase. Microstructure tests using light microscopy, electron scanning microscopy and X-ray diffraction methods, have been performed. On this basis, a presence of particles rich in zirconium and molybdenum, and in case of the alloy with 28 at.% aluminium and 5 at.% chromium — the presence of sigma phase (FeCr), has been found. Also, the results of the study of the microstructure influence on the electrochemical corrosion resistance in the 5 % NaCl solution have been presented. The Fe-26Al-2Cr-1Mo-0.1Zr-0.005B at.% and Fe-26Al-5Cr-1Mo-0.1Zr-0.005B at.% alloys exhibited increased corrosion resistance in comparison to the Fe-23Al-1Mo-0.1Zr-0.005B at.% alloy without chromium addition. The appearance of the sigma phase in the alloy of Fe-28Al-5Cr-1Mo-0.1Zr-0.005B at.% chemical composition resulted in lowering the corrosion resistance of this alloy and a change in corrosion character from the pitting to the intercrystalline one.

Structural aspects of corrosion resistance in alloys based on the Fe3Al intermetallic phase in the cast state

Institute of Materials Science and Applied Mechanics, Wroclaw University of Technology, Smoluchowskiego 25, 50-372, Wrocław, Poland

Institute of Basic Technical Sciences, Maritime University of Szczecin, Podgórna 51-53, 70-205, Szczecin, Poland

Institute of Metallurgy and Material Science, Polish Academy of Sciences, Reymonta 25, 30-095, Kraków, Poland

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

This paper presents the results of investigation of four cast alloys based on the Fe3Al intermetallic phase. Microstructure tests using light microscopy,...

Structural aspects of corrosion resistance in alloys based on the Fe3Al intermetallic phase in the cast state

Publié en ligne: 14 sept. 2012

Pages: 217 - 225

DOI: https://doi.org/10.2478/s13536-012-0034-z

Mots clés
Fe3Al based iron aluminides, microstructure, electrochemical corrosion, sigma phase

© 2012 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Structural aspects of corrosion resistance in alloys based on the Fe3Al intermetallic phase in the cast state

Publié en ligne: 14 sept. 2012

Pages: 217 - 225

DOI: https://doi.org/10.2478/s13536-012-0034-z

Mots clésFe3Al based iron aluminides, microstructure, electrochemical corrosion, sigma phase

© 2012 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
Fe3Al based iron aluminides, microstructure, electrochemical corrosion, sigma phase