Low cycle fatigue behavior of ferritic Fe-24Cr-4Al alloy at high temperatures

Journal Article · Mon May 15 04:00:00 EDT 1995 · Scripta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-716X(95)00241-M· OSTI ID:69650

Tjong, S C; Zhang, J S ^[1]

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1. City Polytechnic of Hong Kong, Kowloon (Hong Kong). Dept. of Physics and Materials Science

The Fe-24Cr-4Al alloy exhibits serrated flow behavior at 400--600 C. Transmission electron microscopy reveals that both coplanar slip and dislocation pile-ups are observed in this alloy cyclically deformed at various total strain amplitudes. There is no strong interaction between Al and dislocations at room temperature and the microstructural response to fatigue of Fe-Cr-Al alloy at room temperature follows the same features as the ferritic Fe-Cr alloy, i.e. labyrinth and cell-like structures. However, the interaction between the solute Al and dislocations at high temperature limits the extent of cross-slip and hence the tendency for cell formation is suppressed.

• OSTI ID: 69650
• Journal Information: Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 10 Vol. 32; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
DISLOCATIONS
EXPERIMENTAL DATA
FATIGUE
HEAT TREATMENTS
IRON BASE ALLOYS
QUENCHING
SAMPLE PREPARATION
SLIP
TRANSMISSION ELECTRON MICROSCOPY