LIQUID METAL FUEL REACTOR EXPERIMENT. ZIRCONIUM NITRIDE FILM THEORY
According to theory. the corrosion of certain steel alloys is inhibited by the formation of a protective film of ZrN, the nitrogen being present in the steel in the form of nitrides or in solid solution with the metal. The primary purpose of this investigation is to verify existing theory as applied to Croloy 2 1/2 by determining the level of nitrogen Plesent in typical commercial heats. the effects of aluminum and of heat treatment on the nitrogen available for film formation. the minimum nitrogen necessary for film formation. and the effects of C. Mn. Si. N, and residual elements on film formation and retention. Samples from 21 commercial heats of Croloy 2 1/4 were analyzed to determine their nitrogen and aluminum contents. The concentration of nitrogen ran from 0.010 to 0.016%; aluminum, 0.008 to 0.037%. Other specimens from three representative heats were further tested by quenching from 180/sup o/F and then reheating for 24 hr at temperatures from 750 to 1350/sup o/F. Analyses indicate that the metal loses a significant portion of its free nitrogen in the 1150 to 1350/sup o/F temperature range. A number of vacuum-melted alloys were prepared from ultra- pure materials for corrosion tests to determine the individual effects of minor alloying and residual elements. Owing to the termination of the project, only melting techniques, specimen preparation, and preliminary corrosion tests were completed. (auth)
- Research Organization:
- Babcock and Wilcox Co. Atomic Energy Div., Lynchburg, Va.
- DOE Contract Number:
- AT(30-1)-1940
- NSA Number:
- NSA-15-004245
- OSTI ID:
- 4108330
- Report Number(s):
- BAW-1087
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-61
- Country of Publication:
- United States
- Language:
- English
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