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Nickel Ion Irradiation Effects on the Microstructure of 2 1/4% Cr 1% Mo Steel and a Comparison with Neutron Irradiation Data

Kai, J-J
Assistant professor, research engineer, research scientist, professor of metallurgical engineering, and Grainger professor of nuclear engineering and director,University of Wisconsin,WI,

Sindelar, RL
Assistant professor, research engineer, research scientist, professor of metallurgical engineering, and Grainger professor of nuclear engineering and director,University of Wisconsin,WI,

Plumton, DL
Assistant professor, research engineer, research scientist, professor of metallurgical engineering, and Grainger professor of nuclear engineering and director,University of Wisconsin,WI,

Dodd, RA
Assistant professor, research engineer, research scientist, professor of metallurgical engineering, and Grainger professor of nuclear engineering and director,University of Wisconsin,WI,

Kulcinski, GL
Assistant professor, research engineer, research scientist, professor of metallurgical engineering, and Grainger professor of nuclear engineering and director,University of Wisconsin,WI,

Pages: 7    Published: Jan 1987

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Source: STP955-EB

Abstract

A 2 1/4 Cr 1% Mo steel, heat treated to consist of upper and lower bainite and ferrite, has been shown to undergo substantial microstructural modification when irradiated with 14-MeV nickel ions at 500°C to 350 dpa at the peak damage depth. The original cementite (Fe³C) in upper and lower bainite was replaced by Chi phase, M⁷C³ and M²C in upper bainite, and Chi and M⁷C³ in lower bainite. The originally precipitate-free ferrite contained a significant fraction of G phase after irradiation. The replacement of Fe³C by M⁷C³ and M²C is consistent with the fact that M⁷C³ and M²C form in a quenched and tempered 2 1/4 Cr 1 Mo steel, but at higher tempering temperatures than does Fe³C. On the other hand, Chi and G phases have not been reported to occur in this steel as a result of thermal treatments. The steel is resistant to void swelling, which amounted to 0.2% or less even at the rather high dpa levels employed in this study. The quantitative data for precipitate and void number densities and sizes agree quite well with a companion neutron irradiation study of the same steel possessing an identical microstructure.

Keywords:
Ion irradiation, ferritic steel, microstructural modification, void swelling, helium, precipitate extraction replica, transmission electron microscopy, analytical electron microscopy

Paper ID: STP33845S
Committee/Subcommittee: E10.07
DOI: 10.1520/STP33845S
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