Effects of oxidation on the impact energy of Hastelloy S and Hastelloy C-4 Charpy V-notch specimens heated in air at 600 to 800 [electronic resource].
- Published:
- Columbus, Ohio : Battelle Memorial Institute, 1981.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Additional Creators:
- Battelle Memorial Institute and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Summary:
- The /sup 90/SrF/sub 2/ heat source being developed at PNL utilizes a Hastelloy S or Hastelloy C-4 outer capsule having a 0.5-in.-thick wall to contain the Hastelloy C-276 inner capsule. The primary objective of the study was to demonstrate that the air oxidation of the outer capsule that could occur during heat-source service would not degrade the ductility and Charpy impact strength of the capsule below the licensing requirements given in Section 1.1. The /sup 90/SrF/sub 2/ heat source under development is intended for general-purpose use. Compatibility considerations limit the interface temperature between the /sup 90/SrF/sub 2/ and Hastelloy C-276 inner capsule to a maximum of 800/sup 0/C. The outer capsule surface temperature will be somewhat less than 800/sup 0/C, and depending on the service, may be substantially lower. The oxidation tests were therefore carried out at 600/sup 0/ to 800/sup 0/C for exposures up to 10,000h to cover the range of temperature the outer capsule might expect to encounter in service. The results showed that the oxidation of Hastelloy S and Hastelloy C-4 in air at 600/sup 0/ to 800/sup 0/C is very slow, and both alloys form adherent oxide layers that serve to protect the underlying metal. Subsurface attack of Hastelloy S and Hastelloy C-4 due to oxidation was greater than expected, considering the slow oxidation rates of the two alloys at 600/sup 0/ to 800/sup 0/C. Estimates of subsurface attack, determined from micrographs of the oxidized specimens, showed erratic results and it was impossible to assign any type of rate equation to the subsurface attack. A conservative estimate of long-term effects can be made using a linear extrapolation of the test results. There were no significant differences between the room-temperature Charpy impact energy of Hastelloy S and Hastelloy C-4 specimens oxidized in air at 600/sup 0/ to 800/sup 0/C and control specimens heated in vacuum.
- Report Numbers:
- E 1.99:pnl-3641
pnl-3641 - Subject(s):
- Other Subject(s):
- Capsules
- Materials
- Hastelloy S.
- Impact Strength
- Microstructure
- Oxidation
- Hastelloys
- Radioisotope Heat Sources
- Experimental Data
- Impact Tests
- Strontium 90.
- Alkaline Earth Isotopes
- Alloys
- Beta Decay Radioisotopes
- Beta-Minus Decay Radioisotopes
- Chemical Reactions
- Chromium Alloys
- Containers
- Crystal Structure
- Data
- Even-Even Nuclei
- Heat Resistant Materials
- Heat Resisting Alloys
- Heat Sources
- Information
- Intermediate Mass Nuclei
- Iron Alloys
- Isotopes
- Materials Testing
- Mechanical Properties
- Mechanical Tests
- Molybdenum Alloys
- Nickel Alloys
- Nickel Base Alloys
- Nuclei
- Numerical Data
- Radioisotopes
- Strontium Isotopes
- Testing
- Years Living Radioisotopes
- Nesdps Office Of Nuclear Energy Space And Defense Power Systems
- Note:
- Published through SciTech Connect.
01/01/1981.
"pnl-3641"
Fullam, H.T. - Funding Information:
- AC06-76RL01830
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