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Development and Evaluation of High-Temperature Tungsten Alloys : Final Report, October 1, 1960 - September 30, 1960

Description: This report summarizes investigations taken between October 1, 1959, to September 30, 1960 with the objectives of developing high-tungsten alloys which are readily fabricable into massive and complex shapes and which possess adequate strength for operation at temperatures up to 2000 F. Within this report, studies are divided into two main categories: alloy development and material fabrication techniques
Date: December 14, 1960
Creator: Holtz, F. C. & Van Thyne, R. J.
Partner: UNT Libraries Government Documents Department

Metallography of Aluminum and Its Alloys: Use of Electrolytic Polishing

Description: Recent methods are described for electropolishing aluminum and aluminum alloys. Numerous references are included of electrolytic micrographic investigations carried out during the period 1948 to 1952. A detailed description of a commercial electrolytic polishing unit, suitable for micrographic examination of aluminum and its alloys, is included.
Date: November 1955
Creator: Jacquet, Pierre A.
Partner: UNT Libraries Government Documents Department


Description: In the past, heat-and-pressure-curing resins have been used almost exclusively as mounting materials for metallographic samples. Now, however, certain polyester resins, which are curable at room temperature, are equally as good for this purpose, and with their versatility they adapt readily to a variety of mounting conditions. A study of the epoxies and polyesters was made to determine which type of resin would satisfy the desirable properties of a metallographic mount. Four polyester resins were selected and investigated intensively to ascertain the variables associated with their curing processes. The results are compared with the standard thermosetting mounting material, Bakelite. (auth)
Date: September 1, 1963
Creator: Kruger, O.L.; Hughes, J.P. & Schmitz, F.J.
Partner: UNT Libraries Government Documents Department


Description: The EB Welder was qualified to produce the 1K retainer weld in February 2001. Since that time, several parts were replaced and metallography results from a review indicated that the welder was not operating properly. After testing the EB Welder, it was requalified to produce the 1K retainer weld.
Date: September 7, 2005
Creator: Schell, J. H.
Partner: UNT Libraries Government Documents Department


Description: A Bausch and Lomb metallograph that had been adapted so that it could be operated remotely was modified further to facilitate its operation. The instrument has performed satisfactorily in the examination of highly radioactive materials behind the heavy shielding of a high level cell. (auth)
Date: December 1, 1959
Creator: Leith, W.H.
Partner: UNT Libraries Government Documents Department


Description: Requirements for successfull polishing of metallographic specimens are discussed and the design of a machine to accomplish such work on radioactive specimens in a metallographic cave is presented. Quality results, readily obtrained by use of the ANL machine, are illustrated by photomicrographs. (auth)
Date: August 1, 1959
Creator: Brown, F.L.; Paine, S.H.; Fousek, R.J. & Armstrong, J.L.
Partner: UNT Libraries Government Documents Department


Description: A description of hot laboratory metallography and techniques of operation are presented. These facilities and techniques provided a means of examining fuel elements that contain UO/sub 2/ after irradiation to high burnups. Some unusual irradiation characteristics of UO/sub 2/ were observed, and each effect is discussed. A complete explanation of the causes of such effects has not yet been obtained. (auth)
Date: January 15, 1958
Creator: Barney, W.K. & Wemple, B.D.
Partner: UNT Libraries Government Documents Department


Description: Various metallographic techniques were employed to determine the best method for the preparation of Al-clad, Ni-plated U fuel elements for bond studies. The quality of the final results and the speed of the preparation were the most important factors to be considered. The procedure presented was found to yield the most advantageous results in the minimum amount of time. (W.L.H.)
Date: March 27, 1957
Creator: Woods, H.W.
Partner: UNT Libraries Government Documents Department


Description: The rapid technological development of the nuclear and space industries has placed a great demand on metal joining processes. One of the most promising processes is electron beam welding. Welding with the electron beam ofiers high integrity in addition to the ability to fabricate unusual configurations. Advanced nuclear fuels require both reliability and unusual designs for satisfactory operation under extreme conditions of temperature and stress. To investigate the problems and techniques involved in fabricating large, advanced nuclear fuel components from Zircaloy-2 material, several cladding pieces were designed and built using the electron beam process. These designs included five basic joint types for assembling the cladding. Destructive and nondestructive examinations were employed including corrosion testing and extensive metallographic examination. Weldment size, fit-up'' of the parts to be joined, fixturing and work carriage mechanisms, as they pertain to electron beam welding, are also discussed. The electron beam process has been demonstrated as a very satisfactory method for fabricating unusual fuel cladding. Fuel cladding components with lengths up to 8 ft have been fabricated for in-reactor irradiation. (auth)
Date: October 1, 1963
Creator: Klein, R.F.
Partner: UNT Libraries Government Documents Department

Baseline Microstructural Characterization of Outer 3013 Containers

Description: Three DOE Standard 3013 outer storage containers were examined to characterize the microstructure of the type 316L stainless steel material of construction. Two of the containers were closure-welded yielding production-quality outer 3013 containers; the third examined container was not closed. Optical metallography and Knoop microhardness measurements were performed to establish a baseline characterization that will support future destructive examinations of 3013 outer containers in the storage inventory. Metallography revealed the microstructural features typical of this austenitic stainless steel as it is formed and welded. The grains were equiaxed with evident annealing twins. Flow lines were prominent in the forming directions of the cylindrical body and flat lids and bottom caps. No adverse indications were seen. Microhardness values, although widely varying, were consistent with annealed austenitic stainless steel. The data gathered as part of this characterization will be used as a baseline for the destructive examination of 3013 containers removed from the storage inventory.
Date: July 31, 2005
Creator: Zapp, Phillip E. & Dunn, Kerry A
Partner: UNT Libraries Government Documents Department

Microstructural Characterization of Nodular Ductile Iron

Description: The objective of this study is to quantify the graphite particle phase in nodular ductile iron (NDI). This study provides the basis for initializing microstructure in direct numerical simulations, as part of developing microstructure-fracture response models. The work presented here is a subset of a PhD dissertation on spall fracture in NDI. NDI is an ideal material for studying the influence of microstructure on ductile fracture because it contains a readily identifiable second-phase particle population, embedded in a ductile metallic matrix, which serves as primary void nucleation sites. Nucleated voids grow and coalesce under continued tensile loading, as part of the micromechanisms of ductile fracture, and lead to macroscopic failure. For this study, we used 2D optical microscopy and quantitative metallography relationships to characterize the volume fraction, size distribution, nearest-neighbor distance, and other higher-order metrics of the graphite particle phase. We found that the volume fraction was {Phi} = 0.115, the average particle diameter was d{sub avg} = 25.9 {mu}m, the Weibull shape and scaling parameters were {beta} = 1.8 and {eta} = 29.1 {mu}m, respectively, the (first) nearest neighbor distance was L{sub nn} = 32.4 {mu}m, the exponential coefficients for volume fraction fluctuations was A{sub {Phi}} = 1.89 and B{sub {Phi}} = -0.59, respectively. Based on reaching a coefficient-of-variation (COV) of 0.01, the representative volume element (RVE) size was determined to be 8.9L{sub nn} (288 {mu}m).
Date: January 3, 2012
Creator: Springer, H. K.
Partner: UNT Libraries Government Documents Department

Investigation of Thermal-Stress-Fatigue Behavior of Stainless Steels. Quarterly Progress Report No. 3, July-September 1962

Description: The thermal-stress-fatigue testing of Types 304 (0.05% C) and 304-L (0.018% C) stainless steels is discussed. Prior to the actual testing, the existing machines were upgraded in performance capability, and additional electronic equipment for measuring the test variables was installed. The majority of specimens tested to date were of Type 304 stainless steel. These tests were run at a rate of temperature change equivalent to a strain rate of 0.005 in. per in. per sec. Mean temperatures of 400, 500, and 600 un. Concent 85% C are being used in conjunction with temperature changes of sufficient magnitude to ensure low cycles-to-failure fatigue lives. Emphasis is being placed on metallographic examination of failure regions, in an effort to ascertain the morphology of fatigue failure. Results to date have not revealed striking differences among specimens tested under different conditions. (auth)
Date: October 31, 1963
Creator: Horton, K. E.
Partner: UNT Libraries Government Documents Department


Description: Metallographic techniques are described which were developed for examining coated and uncoated uranium carbid particles, both in the unsupported condition and in graphite matrices. The structural and compositional variations in various batches and within a given batch are presented, and the effects of various heat treatments on the particles and the coatings are described. (D.L.C.)
Date: March 21, 1962
Creator: DuBose, C.K.H. & Gray, R.J.
Partner: UNT Libraries Government Documents Department