Influence of the microstructure on flow stress and deformability of iron-aluminium alloys

authored by: Julius Peddinghaus, Kai Brunotte, Hendrik Wester, Michael Till, Christoph Kock, Bernd Arno Behrens
Abstract: Due to their higher weight-specific and high-temperature strength, iron-aluminium alloys have a high potential to replace steel in various applications. The good availability of the two materials, the excellent recyclability, lower density with increasing aluminium content and the high corrosion resistance in sulphide- and sulphur-rich environments are further advantages. However, with increasing aluminium content, ductility of FeAl alloys decreases due to hydrogen embrittlement at room temperature. As a result, iron-aluminium alloys have been excluded from potential applications, particularly structural ones. Investigations on powder metallurgical produced iron-aluminium alloys show that fine-grained microstructures can lead to significant improvement in ductility. Assuming equal grain diameters, higher toughness is expected in case of metallurgical ingot production followed by hot forming. The present work deals with the mechanical properties of fine-grained microstructure in iron-rich iron-aluminium alloys, pre-processed through Equal Channel Angular Pressing. In order to characterize the mechanical properties, compression tests with the alloys Fe9AI, Fe28AI and Fe38AI are carried out at different temperatures. The flow curves determined are then compared with those from as-cast state. In addition, deformation capacity is examined optically on slopes of external cracks. In conclusion, the results are discussed based on the microstructure.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
Type: Conference contribution
Pages: 199-204
No. of pages: 6
Publication date: 30.06.2022
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Mechanics of Materials, Metals and Alloys, Surfaces, Coatings and Films
Electronic version(s): https://doi.org/10.37904/metal.2022.4393 (Access: Open)
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{4b00537ad3d44ac3a38a5d5ba78e7ff8,
title = "Influence of the microstructure on flow stress and deformability of iron-aluminium alloys",
abstract = "Due to their higher weight-specific and high-temperature strength, iron-aluminium alloys have a high potential to replace steel in various applications. The good availability of the two materials, the excellent recyclability, lower density with increasing aluminium content and the high corrosion resistance in sulphide- and sulphur-rich environments are further advantages. However, with increasing aluminium content, ductility of FeAl alloys decreases due to hydrogen embrittlement at room temperature. As a result, iron-aluminium alloys have been excluded from potential applications, particularly structural ones. Investigations on powder metallurgical produced iron-aluminium alloys show that fine-grained microstructures can lead to significant improvement in ductility. Assuming equal grain diameters, higher toughness is expected in case of metallurgical ingot production followed by hot forming. The present work deals with the mechanical properties of fine-grained microstructure in iron-rich iron-aluminium alloys, pre-processed through Equal Channel Angular Pressing. In order to characterize the mechanical properties, compression tests with the alloys Fe9AI, Fe28AI and Fe38AI are carried out at different temperatures. The flow curves determined are then compared with those from as-cast state. In addition, deformation capacity is examined optically on slopes of external cracks. In conclusion, the results are discussed based on the microstructure.",
keywords = "Equal Channel Angular Pressing (ECAP), Flow stress, Hot forming, Iron-aluminium alloys, Microstructure",
author = "Julius Peddinghaus and Kai Brunotte and Hendrik Wester and Michael Till and Christoph Kock and Behrens, {Bernd Arno}",
note = "Funding Information: The authors would like to thank the German Research Foundation (DFG) for the financial support [funding number: 142849202]. ; 31st International Conference on Metallurgy and Materials, METAL 2022 ; Conference date: 18-05-2022 Through 19-05-2022",
year = "2022",
month = jun,
day = "30",
doi = "10.37904/metal.2022.4393",
language = "English",
series = "Proceedings International Conference on Metallurgy and Materials ",
publisher = "TANGER Ltd.",
pages = "199--204",
booktitle = "31st International Conference on Metallurgy and Materials, METAL 2022",
}