INFLUENCE OF THE MICROSTRUCTURE ON FLOW STRESS AND DEFORMABILITY OF IRON-ALUMINIUM ALLOYS

1 PEDDINGHAUS Julius
Co-authors:
1 BRUNOTTE Kai 1 WESTER Hendrik 1 TILL Michael 1 KOCK Christoph 1 BEHRENS Bernd-Arno
Institution:
1 Leibniz University Hannover, Institute of Forming Technology and Machines, Garbsen, Germany, EU, peddinghaus@ifum.uni-hannover.de
Conference:
31st International Conference on Metallurgy and Materials, Orea Congress Hotel Brno, Czech Republic, EU, May 18 - 19, 2022
Proceedings:
Proceedings 31st International Conference on Metallurgy and Materials
Pages:
199-204
ISBN:
978-80-88365-06-8
ISSN:
2694-9296
Published:
30th June 2022
Proceedings of the conference have already been published in Scopus and we are waiting for evaluation and potential indexing in Web of Science.
Metrics:
247 views / 131 downloads
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 Fe9Al, Fe28Al and Fe38Al 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: Iron-aluminium alloys, Microstructure, Equal Channel Angular Pressing (ECAP), Hot forming; Flow stress

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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