Microstructure evolution of selected ferritic-martensitic steels under dual-beam irradiation

Book · Sat Nov 01 04:00:00 EST 1997

OSTI ID:541145

Wanderka, N; Camus, E; Wollenberger, H ^[1]

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1. Hahn-Meitner-Inst. Berlin GmbH (Germany)

The authors present experimental results on the microstructure evolution of dual-beam irradiated (300 keV heavy ions plus 15 keV helium ions) ferritic-martensitic steels (Manet, DIN 1.4926, F82H mod). The helium bubble morphology as well as microchemistry of the alloys are investigated by means of transmission electron microscopy and field-ion microscopy with atom probe. The alloys were irradiated to fluences up to 50 dpa and implanted with helium up to a concentration of 1 at.% at the temperatures of 723 K and 773 K. The damage and implantation rates varied from 2.5 {center_dot} 10{sup {minus}3} dpa/s to 2.5 {center_dot} 10{sup {minus}2} dpa/s and from 0.5 appm/s to 5 appm/s, respectively. Size and number density of helium bubbles is found to be rate dependent. Smaller implantation rates produce larger helium bubbles and smaller bubble number densities. Regions of local enrichment of alloy elements, typically 5 nm in size, containing chromium (up to 40 at.%), silicon, and nickel are detected. Number densities of helium bubbles and of regions of chromium enrichments are comparable and lie between 10{sup 23}/m{sup 3} and 10{sup 24}/m{sup 3}. Possible extrapolation of the present ion irradiations to spallation source and fusion reactor conditions is shortly addressed.

• OSTI ID: 541145
• Report Number(s): CONF-961202--; ISBN 1-55899-343-6
• Country of Publication: United States
• Language: English

Related Subjects

07 ISOTOPE AND RADIATION SOURCES
36 MATERIALS SCIENCE
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ACCELERATORS
EXPERIMENTAL DATA
FERRITIC STEELS
INTERSTITIAL HELIUM GENERATION
MARTENSITIC STEELS
MICROSTRUCTURE
NEUTRON SOURCES
PHYSICAL RADIATION EFFECTS
THERMONUCLEAR REACTOR MATERIALS