Atom Probe Tomography Characterization of the Solute Distributions in a Neutron-Irradiated and Annealed Pressure Vessel Steel Weld (NUREG/CR-6629)

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Publication Information

Manuscript Completed: July 1999
Date Published: November 2000

Prepared by:
M. K. Miller, K. F. Russell,
R. E. Stoller, P. Pareige*

Oak Ridge National Laboratory
Managed by Lockheed Martin Energy Research Co.
Oak Ridge, TN 37831-6151

*Groupe de Métallurgie Physique, UMR-6634 CNRS
Faculté des Sciences de l´ Université de Rouen
76821 Mont Saint AIGNAN, France

C. J. Fairbanks, NRC Project Manager

Prepared for:
Division of Engineering Technology
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

NRC Job Code W6953

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Abstract

A combined atom probe tomography and atom probe field ion microscopy study has been performed on a submerged arc weld irradiated to high fluence in the Heavy-Section Steel Irradiation (HSSI) fifth irradiation series (Weld 73W). The composition of this weld is Fe -0.27 at. % Cu, 1.58% Mn, 0.57% Ni, 0.34% Mo, 0.27% Cr, 0.58% Si, 0.003% V, 0.45% C, 0.009% P, and 0.009% S. The material was examined after five conditions: after a typical stress relief treatment of 40 h at 607°C, after neutron irradiation to a fluence of 2 x 10²³ n m^-2 (E > 1 MeV), and after irradiation and isothermal anneals of 0.5, 1, and 168 h at 454°C. This report describes the matrix composition and the size, composition, and number density of the ultrafine copper-enriched precipitates that formed under neutron irradiation and the change in these parameters with post-irradiation annealing treatments.