42 Matching Results

Search Results

Advanced search parameters have been applied.

Corrosion and stress-corrosion cracking of welded uranium-6 weight percent niobium

Description: The resistance of corrosion and stress-corrosion cracking of welded U--6 wt% Nb in oxygen-saturated water containing 50 ppM chloride ions was investigated. The tests showed that a post-weld heat treatment consisting of solution quenching and underaging (350 deg C for 42 min) provided the best resistance to corrosion and pitting corrosion. Although selective corrosion and pitting corrosion were observed on many of the specimens tested, no evidence of stress-corrosion cracking was found. (auth)
Date: December 27, 1973
Creator: Macki, J. M. & Kochen, R. L.
Partner: UNT Libraries Government Documents Department

Generalized method of computing carbon-diffusion profiles in austenitic stainless steels exposed to a sodium environment

Description: Numerous experimental observations on the carburization-decarburization behavior of austenitic stainless steels in hightemperature flowing sodium have been reported; however, quantitative predictions of carbon diffusion in the steels under specific environmental conditions have been difficult. A mathematical analysis for the process has been developed that incorporates (1) the thermodynamic and kinetic information for carbon in the alloys, (2) the thermal-mechanical treatment of the material (solution annealed versus cold worked) that influences the microstructure, and (3) the carbon concentration in sodium and its dependence on sodium-system parameters. Carbon concentrationdistance profiles in Types 304 and 316 stainless steel were generated as a function of time, temperature, and carbon concentration in sodium and compared with experimental data. The analysis was used to evaluate the carburization -- decarburization behavior of Type 316 stainless steel fuel cladding exposed to sodium and to develop carbon-diffusion profiles in Type 304 stainless steel intermediate-heat-exchanger piping upon exposure to primary- and secondary-system sodium for periods to 30 y. (auth)
Date: June 1, 1973
Creator: Snyder, R.B.; Natesan, K. & Kassner, T.F.
Partner: UNT Libraries Government Documents Department

Corrosion studies in plutonium--nitric--hydrofluoric solutions

Description: Several alloys were evaluated as possible construction material in chemical processing equipment for plutonium at Rocky Flats. Corrosion studies were made of these alloys in solutions obtained from a production storage tank. The principal components of these solutions were RNO/sub 3/, HF, and Pu. Results showed relative concentrations of these components can significantly affect corrosion rates. Of the alloys tested, lnconel 690 exhibited the lowest corrosion rates in the process solutions. E-Brite 26-1 also showed corrosion resistance greater than 304L stainless steel. (auth)
Date: February 1, 1974
Creator: Terada, K.; Macki, J. M.; Dringman, M. R. & Cash, D. L.
Partner: UNT Libraries Government Documents Department

Corrosion-induced acoustic emissions from uranium 4.5--weight percent niobium binary alloy

Description: The ability to monitor corrosion and stress-corrosion cracking of uranium 4.5-weight percent niobium was investigated. The acoustic emissions from stress-corrosion cracking were monitored using smooth four-point bend specimens, which were immersed in oxygen-saturated water containing chloride ions. The acoustic emissions from corrosion were monitored from rectangular corrosion coupons. These latter specimens were exposed to nitrogen-saturated and oxygen- saturated solutions of distilled water and distilled water with chloride ions. Dilute solutions of hydrochloric acid were also used. Findings show that stress- corrosion crack monitoring of the alloy was successful. Corrosion monitoring of the alloy showed a direct correlation between corrosion rate (based on weight loss) and total acoustic emissions. For a specific range, one can calculate the corrosion rate of uranium alloys in a corrosive solution from the total acoustic emissions generated. Studies to determine the source of corrosion-induced acoustic emissions were inconclusive.
Date: December 15, 1975
Creator: Mah, R.; Kochen, R. L. & Macki, J. M.
Partner: UNT Libraries Government Documents Department