Void swelling resistance in Fe-Cr alloys at 200 dpa

Book · Fri Sep 01 04:00:00 EDT 1995

OSTI ID:99428

Gelles, D S ^[1]

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1. Pacific Northwest Lab., Richland, WA (United States)

Microstructural examinations have been performed on a serious of binary Fe-cr alloys irradiated to 200 dpa at 425 C in a fast breeder reactor. The alloy compositions ranged from 3% to 18% Cr in 3% Cr increments, and the irradiation temperature corresponded to the peak swelling condition for this alloy class. Density measurements showed swelling levels as high as 7.4%, with the highest swelling found in the Fe-9Cr and Fe-6Cr alloys. Microstructural examinations revealed that the highest swelling conditions contained well-developed voids, often as large as 100 nm, and a dislocation network comprised of both a/2<111> and a<100> Burgers vectors. Swelling was lower in the other alloys, and the swelling reduction could be correlated with increased precipitation. These results are considered in light of the current theories for low swelling in ferritic alloys, but no theory is available to completely explain the results.

• DOE Contract Number: AC06-76RL01830
• OSTI ID: 99428
• Report Number(s): CONF-941144--; ISBN 1-55899-275-8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
CRYSTAL DEFECTS
EXPERIMENTAL DATA
IRON BASE ALLOYS
MICROSTRUCTURE
PHYSICAL RADIATION EFFECTS