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Article

Effect of Higher Silicon Content and Heat Treatment on Structure Evolution and High-Temperature Behaviour of Fe-28Al-15Si-2Mo Alloy

1
Department of Technology, Faculty of Mechanical Engineering, Technical University of Liberec, 461 17 Liberec, Czech Republic
2
Department of Material Science, Faculty of Mechanical Engineering, Technical University of Liberec, 461 17 Liberec, Czech Republic
3
Department of Foundry Engineering, Brno University of Technology, 601 90 Brno, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editor: Jan Frenzel
Materials 2021, 14(11), 3031; https://doi.org/10.3390/ma14113031
Received: 14 May 2021 / Revised: 26 May 2021 / Accepted: 29 May 2021 / Published: 2 June 2021
This paper describes the structure and properties of cast Fe3Al-based alloy doped with 15 at. % of silicon and 2 at. % of molybdenum. The higher content of silicon is useful for the enhancement of high-temperature mechanical properties or corrosion resistance of iron aluminides but deteriorates their workability due to increased brittleness. It was found that the presence of both alloying elements leads to an increase of values of the high-temperature yield stress in compression. The heat treatment (annealing at 800 °C for 100 h) used for the achievement of phase stability causes the grain coarsening, so the values of the high-temperature yield stress in compression are lower at 600 °C and 700 °C in comparison to values measured for the as-cast state. This stabilization annealing significantly improves the workability/machinability of alloy. Furthermore, the higher silicon content positively affects the values of the thermal expansion coefficient that was found to be lower in the temperature range up to 600 °C compared to alloys with lower content of silicon. View Full-Text
Keywords: Fe3Al-based iron aluminide for high-temperature applications; high-temperature yield stress; coefficient of thermal expansion Fe3Al-based iron aluminide for high-temperature applications; high-temperature yield stress; coefficient of thermal expansion
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MDPI and ACS Style

Švec, M.; Vodičková, V.; Hanus, P.; Pazourková Prokopčáková, P.; Čamek, L.; Moravec, J. Effect of Higher Silicon Content and Heat Treatment on Structure Evolution and High-Temperature Behaviour of Fe-28Al-15Si-2Mo Alloy. Materials 2021, 14, 3031. https://doi.org/10.3390/ma14113031

AMA Style

Švec M, Vodičková V, Hanus P, Pazourková Prokopčáková P, Čamek L, Moravec J. Effect of Higher Silicon Content and Heat Treatment on Structure Evolution and High-Temperature Behaviour of Fe-28Al-15Si-2Mo Alloy. Materials. 2021; 14(11):3031. https://doi.org/10.3390/ma14113031

Chicago/Turabian Style

Švec, Martin, Věra Vodičková, Pavel Hanus, Petra Pazourková Prokopčáková, Libor Čamek, and Jaromír Moravec. 2021. "Effect of Higher Silicon Content and Heat Treatment on Structure Evolution and High-Temperature Behaviour of Fe-28Al-15Si-2Mo Alloy" Materials 14, no. 11: 3031. https://doi.org/10.3390/ma14113031

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