Abstract
When iron aluminide (FeAl).is used at elevated temperature, it may be subject to cyclic loading that can cause failure by fatigue cracking or by cyclic creep rupture. For engineering design considerations, the fatigue and cyclic creep behavior must be characterized. In the current research, fatigue experiments were performed on specimens made from FeAl material. The specimens were tested under constant amplitude cyclic loading in air at temperatures from 400 to 750 οC. The frequency was 0.5 Hz, and the stress ratio ( R). was 0.1. Fatigue life and cyclic creep behavior were determined as a function of stress amplitude. Stress-versus-fatigue-life (S-N). curves and stress-versus-cyclic-creep-strain plots were developed at each test temperature. In some cases, significant variations in fatigue and cyclic creep behavior were observed. Based on these observations, specimens were selected for examination by means of scanning electron microscopy(SEM).and metallography. Application of the data to design and reasons for variations in material behavior are discussed.
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