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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: 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: 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

Thermo-Mechanical Processing and Properties of a Ductile Iron

Description: Thermo-mechanical processing of ductile irons is a potential method for enhancing their mechanical properties. A ductile cast iron containing 3.6% C, 2.6% Si and 0.045% Mg was continuously hot-and-warm rolled or one-step press-forged from a temperature in the austenite range (900{degrees}C-1100{degrees}C) to a temperature below the A, temperature. Various amounts of reduction were used (from 60% to more than 90%) followed by a short heat ent at 600`C. The heat ent lead to a structure of fine graphite in a matrix of ferrite and carbides. The hot-and- warm worked materials developed a pearlitic microstructure while the press-forged material developed a spheroidite-like carbide microstructure in the matrix. Cementite-denuded ferrite zones were developed around graphite stringers in the hot-and-warm worked materials, but such zones were absent in the press-forged material. Tensile properties including tensile strength and total elongation were measured along the direction parallel and transverse to the rolling direction and along the direction transverse to the press-forging direction. The tensile ductility and strength both increased with a decrease in the amount of hot-and-warm working. The press- forged materials showed higher strength (645 MPa) than the hot-and-warrn worked materials (575 MPa) when compared at the same ductility level (22% elongation).
Date: July 14, 1997
Creator: Syn, C.K.; Lesuer, R.R. & Sherby, O.D.
Partner: UNT Libraries Government Documents Department

Damage evolution and clustering in shock loaded tantalum

Description: Two grades of tantalum were shock loaded by plate impact and recovered. The loading conditions were varied to study the damage evolution in te materials from incipient to full spallation. The authors performed quantitative image analysis and optical profilometry on the recovered specimens. Statistical analyses are shown of the void sizes, void clustering, and void linking in the two material grades.
Date: December 31, 1998
Creator: Thissell, W.R.; Zurek, A.K.; Rivas, J.M.; Tonks, D.L. & Hixson, R.S.
Partner: UNT Libraries Government Documents Department

Qualification of the Reclamation Welding Parameters for 316 CRES Stems

Description: A demonstration was performed to prove the acceptability of using existing reclamation weld parameters for joining a new fill stem made of 316 Corrosion Resistant Stainless Steel (CRES) to a 304L stainless steel vessel. Previously qualified weld parameters are for welding the old 0.275`` diameter stem of 304L stainless steel to a 304L vessel. The weld quality acceptance criteria included leak rate, proof test, burst strength and evaluation by metallography. All tests and examinations indicated that welds made within the demonstrated parameters met all requirements. The results from this work demonstrate that the welding of 316 CRES 0.275`` diameter stems can be successfully performed using the same weld parameters as those for 304L stems.
Date: September 1, 1997
Creator: Howard, S.R. & McKinney, G.J.
Partner: UNT Libraries Government Documents Department

Development of a Solid-State Resistance Weld for Joining Dual-Burst Disk Assemblies to Vessel Bodies

Description: The objective of this program was to develop a solid-state resistance plug weld for installation of dual-burst disk assemblies in a set of tritium storage vessels. This is a cooperative effort with the Los Alamos National Laboratory. Los Alamos designed the vessels and also designed a supplied ten pairs of tests parts for development. Following development of the weld, a set of about eight vessels will be fabricated for tritium storage tests. These tests will demonstrate functioning of the dual-burst disk assembly in addition to demonstrating long-term compatibility of the plug weld for tritium service.
Date: April 1998
Creator: Kanne, W. R., Jr. & McKinney, G. J.
Partner: UNT Libraries Government Documents Department

Electrodeposition progress report, October 1--31, 1948

Description: The general points being considered in the construction of equipment for the production of High Level Postum Gauzes were mentioned in the last progress report. A more detailed discussion of the progress to date will be made here. The development work of plating postum out of hydrofluoric acid has proceeded to the point where it is desired to make some runs plating out quantities of postum from 10--250 units per gauze. The following points have been considered in a report for limited distribution.
Date: December 31, 1948
Creator: Orban, E.
Partner: UNT Libraries Government Documents Department

Radioactive decontamination of metals by electropolishing

Description: Prior to April 1948 the generally accepted method of reducing the radioactive contamination of metal tools and laboratory apparatus was a series of rinses in aqua regia or various other concentrated acids. This method proved unsatisfactory for three reasons. (A) It was not a dependable method of removing activity. (B) It had a delecterious effect on tools in that it caused serious pitting, which resulted in weakened parts, and exposed a bare metal that was subject to very rapid corrosion. (C) Tools and apparatus once cleaned by this method could not readily be cleaned a second time. With the aforementioned limitations in mind, it became obvious that a new method was required. After considerable investigation into a electrochemical processes the present method was developed. Essentially, the new method is an electropolish bath to remove the activity lodged in the pores of the metal, and a ``follow-up`` chrome plate bath to render the surface impassive to corrosion.
Date: January 25, 1949
Creator: Brodbeck, R.M. & Schommer, G.R.
Partner: UNT Libraries Government Documents Department

An Evaluation of the Sulfuric Acid-Sodium Nitrite Etch for Zircaloy-2

Description: Preliminary experiments indicate that there are no significant differences in the corrosion rates of zirconium or Zircaloy-2 after etching with the nitric--hydrofluoric solution or the sulfuric--nitrite solution, provided proper etching and washing techniques are followed. Incomplete removal of the residual etchant is deleterious to the corrosion resistance; however, this effect in the case of the sulfuric--nitrite solution is not as pronounced as in the case of the nitric--hydrofluoric acid solution. The anticipated advantages in the new etch were not completely realized. Additional development aimed at modifying the sulfuric--nitrite etch would have to be performed in order to overcome the disadvantages before recommendation for the adoption of the etch could be made. (auth)
Date: February 17, 1954
Creator: Kass, S.
Partner: UNT Libraries Government Documents Department

Demonstrating the Feasibility of Molten Aluminum for Destroying Polymeric Encapsulants in SNG-Bearing Metallographic Mounts

Description: DOE-owned spent nuclear fuel (SNF) rods have been cross sectioned and mounted for metallography throughout the history of nuclear reactors. Many hundreds of these ''met mounts'' have accumulated in storage across the DOE complex. However, because of potential hydrogen generation from radiolysis of the polymeric encapsulants, the met mounts are problematic for eventual disposal in a geologic repository.
Date: August 31, 2004
Creator: Stout, Dan & Ploger, Scott
Partner: UNT Libraries Government Documents Department