SYMPOSIA PAPER Published: 01 January 1987
STP25669S

A Study of Radiation Induced Voids and Precipitates and Their Annealing Behavior by Small-Angle Neutron Scattering

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We have studied the annealing response of an irradiated pressure vessel steel, ASTM A302B, using small-angle neutron scattering. We have used two sets of specimens in this study, one irradiated to a fluence of 3 to 4 × 1019 n/cm2 at 288°C, and the other a parallel set of the same steel in the unirradiated condition. We have annealed specimens from each set isothermally at 300, 350, 400, and 450°C for increasing periods of time up to five h, and have observed the variations in the SANS spectra in both irradiated and unirradiated specimens. Changes in the small-angle neutron scattering (SANS) spectra commence at 300°C for the unirradiated material and at 400°C in the irradiated material. The observed response suggests that the changes are caused basically by the precipitation of copper out of solid solution in α-iron during the annealing of unirradiated and irradiated specimens; in the case of the irradiated specimens, the release of damage-induced defects enhances the precipitation of the copper.

Author Information

Ukpong, IE
University of Missouri-Columbia, C. R. State, Nigeria
Krawitz, AD
University of Missouri-Columbia, Columbia, MO
Mildner, DFR
University of Missouri-Columbia, Columbia, MO
Leighly, HP
University of Missouri-Rolla, Rolla, MO
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Developed by Committee: E10
Pages: 480–493
DOI: 10.1520/STP25669S
ISBN-EB: 978-0-8031-5017-1
ISBN-13: 978-0-8031-0963-6