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Fatigue resistance of Fe3Al-based alloys

Published online by Cambridge University Press:  18 January 2011

Florian Gang ,
Manja Krüger ,
Alexandra Laskowsky ,
Heike Rühe ,
Joachim H. Schneibel  and
Martin Heilmaier
Florian Gang
Affiliation:
Otto von Guericke University Magdeburg, Institute for Materials and Joining Technology, P.O. Box 4120, D‑39016 Magdeburg, Germany
Manja Krüger
Affiliation:
Otto von Guericke University Magdeburg, Institute for Materials and Joining Technology, P.O. Box 4120, D‑39016 Magdeburg, Germany
Alexandra Laskowsky
Affiliation:
Otto von Guericke University Magdeburg, Institute for Materials and Joining Technology, P.O. Box 4120, D‑39016 Magdeburg, Germany
Heike Rühe
Affiliation:
Otto von Guericke University Magdeburg, Institute for Materials and Joining Technology, P.O. Box 4120, D‑39016 Magdeburg, Germany
Joachim H. Schneibel
Affiliation:
Otto von Guericke University Magdeburg, Institute for Materials and Joining Technology, P.O. Box 4120, D‑39016 Magdeburg, Germany
Martin Heilmaier
Affiliation:
Technical University Darmstadt, Dept. Materials Science, D-64287 Darmstadt, Germany
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Abstract

The low cycle fatigue (LCF) behaviour of two cast as well as two hot extruded Fe3Al-based iron aluminide alloys, either with or without Cr, is investigated. All four alloys contain microalloying additions of Zr, Nb, C and B. Fatigue tests were carried out under strain control for strain amplitudes in the range of εa = 0.1 – 0.4 % for the cast alloys and εa = 0.1 – 0.7 % for the extruded materials, at frequencies of 1 Hz (extruded Fe3Al) and 3 Hz (all other alloys) and at room temperature and 300 °C. Within the first cycles all alloys show strong cyclic hardening. Furthermore the fatigue strain – fatigue life curves are steeper at 300 °C than at room temperature, showing increased fatigue strength at low cycle numbers due to increasing ductility and decreased fatigue strength at increasing cycle numbers because of reduced yield strength. Cr is found to have only a negligible influence on the fatigue behaviour of Fe3Al-based alloys. Comparison between the differently processed materials shows superior LCF properties of the hot extruded iron aluminides due to significantly smaller grain sizes.

Keywords

fatigueFealloy
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n02-02
Copyright
Copyright © Materials Research Society 2011

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References

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