SYMPOSIA PAPER Published: 01 January 1994

Charpy Impact Toughness of Martensitic Steels Irradiated in FFTF: Effect of Heat Treatment


Charpy tests were made on plates of 9Cr-1MoVNb and 12Cr-1MoVW steels given four different normalizing-and-tempering treatments. Onethird-size Charpy specimens from each steel were irradiated to 7.4-8 × 1026 n/m2 (about 34-37 dpa) at 420°C in the Materials Open Test Assembly of the Fast Flux Test Facility. Specimens were also thermally aged to 20000 h at 400°C to determine the effect of aging during irradiation. Previous work on these steels irradiated to 4–5 dpa at 365°C in MOTA were reexamined in light of the new results. The tests indicated that prior austenite grain size, which was varied by different normalizing treatments, had an effect on impact behavior of the 9Cr-1MoVNb but not on the 12Cr-1MoVW. Tempering treatment had relatively little effect on the shift in DBTT for both steels. Conclusions are presented on how heat treatment can be used to optimize properties.

Author Information

Klueh, RL
Oak Ridge National Laboratory, Oak Ridge, TN
Alexander, DJ
Oak Ridge National Laboratory, Oak Ridge, TN
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Developed by Committee: E10
Pages: 591–606
DOI: 10.1520/STP23960S
ISBN-EB: 978-0-8031-5262-5
ISBN-13: 978-0-8031-1488-3