Surface and microstructural characterization of commercial breeder reactor candidate alloys exposed to 700/sup 0/C sodium [electronic resource].

Published:: Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1979.
Physical Description:: Pages: 50 : digital, PDF file
Additional Creators:: 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:

Sodium compatibility screening tests were performed on several commercial austenitic alloys at 700/sup 0/C for 2000 hours for applications as breeder reactor fuel cladding. The sodium-exposed surfaces were characterized by Optical Metallography, Scanning Electron Microscopy (SEM) and Electron Probe Micro Analysis (EPMA). Sodium exposure generally resulted in the depletion of Ni, Cr, Ti, Si, Mn and Nb, and enrichment of Fe and Mo at the surface. The average thickness of the depleted zone was 5 ..mu..m. The alloys can be divided into three groups based on corrosion rate, and each group has its own characteristic surface structure. Grain-orientation dependent striations were seen in alloys with low corrosion rates, while alloys with intermediate corrosion rates displayed micron-size nodes enriched with Fe and Mo. The high corrosion rate alloys exhibited scale-like formations on the surface with irregularly shaped holes. In addition, the data importantly point out that a ferrite layer will form at the sodium-exposed surface of these austenitic alloys after prolonged exposure.

Report Numbers:

E 1.99:hedl-tme-78-26
hedl-tme-78-26

Subject(s):

Other Subject(s):

Note:

Published through SciTech Connect.
03/01/1979.
"hedl-tme-78-26"
Anantatmula, R.P.; Brehm, W.F.
Hanford Engineering Development Lab., Richland, WA (USA)

Funding Information:

EY-76-C-14-2170

View MARC record | catkey: 14463683