SYMPOSIA PAPER Published: 01 January 1996
STP16512S

Swelling, Mechanical Properties and Structure of Austenitic High-Nickel Alloy Irradiated in a Fast Reactor

Source

Specimens from fuel assembly wrappers and control rod cases of 0.07C-15Cr-35Ni-3Mo-B-Zr-Y alloy were investigated after irradiation in the BOR-60 and BN-600 reactors up to a maximum damage dose of about 110 dpa at temperatures between 340 to 550°C.

Maximum swelling occurs at 420 to 430°C with 6% at a dose of about 80 dpa and 13.5% at a dose of 108 dpa. The maximum change in strength properties and corresponding decrease of ductility occur at an irradiation temperature of 385°C. With increasing testing temperature the ductility increases from 3–6% up to 22% at 450°C for the material irradiated at 60–80 dpa.

Frank dislocation loops with an average diameter of 25 nm (concentration is 2×1016 cm−3), voids having diameter between 20 to 23 nm (concentration is (6–7)×1014 cm−3) and semicoherent needle-like precipitates with an average length of 21 nm, oriented to several directions, were observed in the alloy structure irradiated to 60 dpa at 430°C.

Analysis of the experimental data was performed and the service life time of the investigated alloy was estimated for use as a material for control rod cases of the BOR-60 reactor.

Author Information

Shamardin, VK
Research Institute of Atomic Reactors, Dimitrovgrad, Ulyanovsk Region
Neustroev, VS
Research Institute of Atomic Reactors, Dimitrovgrad, Ulyanovsk Region
Povstyanko, AV
Research Institute of Atomic Reactors, Dimitrovgrad, Ulyanovsk Region
Bulanova, TM
Research Institute of Atomic Reactors, Dimitrovgrad, Ulyanovsk Region
Ostrovsky, ZE
Research Institute of Atomic Reactors, Dimitrovgrad, Ulyanovsk Region
Kuznetzov, AA
Central Research Institute of Structural Materials, St.-Petersburg, Russia
Kursevitch, IP
Central Research Institute of Structural Materials, St.-Petersburg, Russia
Nikolaev, VA
Central Research Institute of Structural Materials, St.-Petersburg, Russia
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Developed by Committee: E10
Pages: 842–857
DOI: 10.1520/STP16512S
ISBN-EB: 978-0-8031-5328-8
ISBN-13: 978-0-8031-2016-7