SEDL / STP / STP1366-EB / STP12413S

Analysis of Stress-Induced Burgers Vector Anisotropy in Pressurized Tube Specimens of Irradiated Ferritic-Martensitic Steels: JFMS and JLF-1

Gelles, DS
Staff Engineer, Battelle Pacific Northwest National Laboratory, Richland, WA

Kimura, A
University of Kyoto, Kyoto,

Shibayama, T
Hokkaido University, Sapporo,

Pages: 13    Published: Jan 2000

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Abstract

A procedure for determining the Burgers vector anisotropy in irradiated ferritic steels is described, allowing identification of all a ⟨ 100 ⟩ and all a/2 ⟨ 111 ⟩ dislocations in a region of interest. The necessary micrographs to apply the procedure have been taken of a pressurized tube specimen of JFMS, a duplex ferritic steel following irradiation in FFTF/MOTA at 407°C to 7.5 × 10²² n/cm² (E > 0.1 MeV) or 37.5 dpa, and a pressurized tube of JLF-1 irradiated at 430°C under similar conditions to 14.3 × 10²² n/cm² (E > 0.1 MeV) or 60 dpa. Analysis of micrographs indicates that large anisotropy in Burgers vector populations develop during irradiation creep.