Influence of long-term thermal aging on the microstructural evolution of nuclear reactor pressure vessel materials [electronic resource] : An atom probe study

Published:: Rockville, Md. : U.S. Nuclear Regulatory Commission, 1998.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: 31 pages : digital, PDF file
Additional Creators:: U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Engineering Technology, U.S. Nuclear Regulatory Commission, and United States. Department of Energy. Office of Scientific and Technical Information

Access Online

www.osti.gov

Availability

Finding items...

Restrictions on Access:

Free-to-read Unrestricted online access

Summary:

Atom probe field ion microscopy (APFIM) investigations of the microstructure of unaged (as-fabricated) and long-term thermally aged (∼ 100,000 h at 280 C) surveillance materials from commercial reactor pressure vessel steels were performed. This combination of materials and conditions permitted the investigation of potential thermal-aging effects. This microstructural study focused on the quantification of the compositions of the matrix and carbides. The APFIM results indicate that there was no significant microstructural evolution after a long-term thermal exposure in weld, plate, or forging materials. The matrix depletion of copper that was observed in weld materials was consistent with the copper concentration in the matrix after the stress-relief heat treatment. The compositions of cementite carbides aged for 100,000 h were compared with the Thermocalc{trademark} prediction. The APFIM comparisons of materials under these conditions are consistent with the measured change in mechanical properties such as the Charpy transition temperature.

Report Numbers:

E 1.99:nureg/cr--6537
E 1.99: ornl/tm--13406
ornl/tm--13406
nureg/cr--6537

Subject(s):

Other Subject(s):

Note:

Published through SciTech Connect.
03/01/1998.
"nureg/cr--6537"
" ornl/tm--13406"
"TI98003314"
Miller, M.K.; Russell, K.F.; Stoller, R.E.; Pareige, P.

Funding Information:

AC05-96OR22464

View MARC record | catkey: 14453760