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Evaluation of weldments in Type 21-6-9 stainless steel for Compact Ignition Tokamak structural applications: Phase 1

Description: Primary design considerations for the Compact Ignition Tokamak toroidal field-coil cases are yield strength and toughness in the temperature range from 77 to 300 K. Type 21-6-9 stainless steel, also still known by its original Armco Steel Company trade name Nitronic 40, is the proposed alloy for this application. It has high yield strength and usually adequate base metal toughness, but weldments in thick sections have not been adequately characterized in terms of mechanical properties or hot-cr… more
Date: June 1, 1991
Creator: Alexander, D. J.; Goodwin, G. M. & Bloom, E. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Inhibiting pitting corrosion in carbon steel exposed to dilute radioactive waste slurries

Description: Dilute caustic high-level radioactive waste slurries can induce pitting corrosion in carbon steel. Cyclic potentiodynamic polarization tests were conducted in simulated and actual waste solutions to determine minimum concentrations of sodium nitrate which inhibit pitting in ASTM A537 class 1 steel exposed to these solutions. Susceptibility to pitting was assessed through microscopic inspection of specimens and inspection of polarization scans. Long-term coupon immersion tests were conducted to … more
Date: January 1, 1991
Creator: Zapp, P. E. & Hobbs, D. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Optimization of film synthesized rare earth transition metal permanent magnet systems

Description: This report reviews work on the optimization of film synthesized rare earth transition metal permanent magnet systems. Topics include: high coercivity in Sm-Fe-Ti-V, Sm-Fe-V, and two element systems; ThMn{sub 12} type pseudobinary SmFe{sub 12 {minus} X}T{sub X}; and sputter process control for the synthesis of precisely textured RE-TM magnetic films. (JL)
Date: January 1, 1990
Creator: Cadieu, F.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An experimental/analytical comparison of strains in encapsulated assemblies

Description: A combined experimental and analytical study of strains developed in encapsulated assemblies during casting, curing and thermal excursions is described. The experimental setup, designed to measure in situ strains, consisted of thin, closed-end, Kovar tubes that were instrumented with strain gages and thermocouples before being over-cast with a polymeric encapsulant. Four bisphenol A (three diethanolamine cured and one anhydride cured) epoxy-based materials and one urethane elastomeric material … more
Date: November 1, 1991
Creator: Guess, T.R. & Burchett, S.N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fluxless laser soldering for electronic packaging

Description: Conventional soldering typically requires the use of reactive fluxes to promote wetting. The resulting flux residues are removed primarily with halogenated or chlorofluorocarbon (CFC) solvents. With the mandated phaseout of CFCs by the year 2000, there has been a concentrated effort to develop alternative, environmentally compatible manufacturing and cleaning technologies that will satisfy the restrictions placed on CFCs, but still yield high quality product. Sandia National Laboratories is cur… more
Date: January 1, 1991
Creator: Hosking, F M & Keicher, D M
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Stress-strain gage measurements on a Nevada Test Site (NTS) event using pairs of triple foil gages

Description: A triple-material stress-strain gage containing foils of ytterbium, manganin, and constantan was tested at LLNL. This gage yields three independent piezoresistance measurements from which an independent set of principal strains and principal stresses can be inferred. We have analyzed the signals from a gage at a specific location buried at a distance from the center of energy of an event at NTS. We inverted the resistivity signals to calculate the stress and strain histories as sensed by the fo… more
Date: November 30, 1990
Creator: Kansa, E. J. & Stout, R. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High-temperature microstructural stability in iron- and nickel-base alloys from rapid solidification processing

Description: The properties and performance of metallic alloys for heat resistant applications depend on the fineness, homogeneity, and stability of their microstructures, particularly after high temperature exposures. Potential advantages of rapid solidification processing (RSP) of alloys for such applications are the homogeneity in composition and fine microstructural features derived from the nature of the RSP process. The main RSP product form is powder, is which obtained by atomizing a narrow melt stre… more
Date: August 1, 1991
Creator: Flinn, J. E.; Bae, J. C. & Kelly, T. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The role of Zr and Nb in oxidation/sulfidation behavior of Fe-Cr-Ni alloys

Description: 05Structural Fe-Cr-Ni alloys may undergo rapid degradation at elevated temperatures unless protective surface oxide scales are formed and maintained. The ability of alloys to resist rapid degradation strongly depends on their Cr content and the chemistry of the exposure environment. Normally, 20 wt % Cr is required for service at temperatures up to 1000{degree}C; the presence of sulfur, however, inhibits formation of a protective surface oxide scale. The oxidation and sulfidation behavior of Fe… more
Date: November 1, 1990
Creator: Natesan, K. (Argonne National Lab., IL (USA)) & Baxter, D.J. (Argonne National Lab., IL (USA) INCO Alloy Ltd., Hereford, England (UK))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Corrosion tests of DWPF recycle solution

Description: Coupon immersion tests were performed on ASTM A537, Class 1 carbon steel in simulated Defense Waste Processing Facility recycle solutions at 93 [plus minus] 2[degree]C, in an effort to reproduce the results of earlier tests in which hard, shock-sensitive deposits were found. There was no evidence of pitting corrosion on the coupons exposed to solutions containing 0.5 M hydroxide and 2000 ppm (0.043 M) nitrite. Liquid mercury and small solid deposits were found on the specimens' immersed surface… more
Date: July 28, 1992
Creator: Zapp, P.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A modification of 4330 alloy steel

Description: We have developed a modification of 4330 alloy steel which does not have an exact equivalent expressed in any standard specification. When we compare the ballistic performance of our modified cast steel in thicknesses of about 120 mm with that of stacked, 24 mm thick rolled 4340 alloy steel plates of comparable hardness and the same total thickness, we do not find a significant difference in terminal ballistic performance against either heavy metal kinetic energy penetrators or precision shaped… more
Date: August 1, 1990
Creator: Gogolewski, Raymond; Cunningham, Bruce J.; Gentile, Robert & Fleming, Scott
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Ion implantation effects on surface-mechanical properties of metals and polymers

Description: Fatigue of 8 complex alloys based on Fe-13Cr-15Ni-2Mo-2Mn-0.2Ti-0.8Si- 0.06C, and single-crystal Fe-15Cr-15Ni, implanted with 400-keV B[sup +] and 550-keV N[sup +] (total dose 2.3[times]10[sup 16] ions/cm[sup 2]) was examined. 600 C creep was also examined. The dual implantation increased hardness but decreased fatigue life of the 8 complex alloys. An optimum strengthening level and a shift to grain boundary cracking were determined. The single crystals also showed reduced fatigue life after im… more
Date: April 1, 1993
Creator: Rao, G.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Low-temperature specific heat of YMn sub 2 in the paramagnetic and antiferromagnetic phases

Description: The low-temperature specific heat of YMn{sub 2} has been measured at applied pressures of 0 to 7.7 kbar. A paramagnetic state is stabilized for moderate values of the applied pressure (of the order of 1.6 kbar). A large linear term in the specific heat, which decreases regularly with increasing pressure, is observed in this phase. It is ascribed to giant spin fluctuations associated with a magnetic-non magnetic instability and a strong geometrical spin frustration.
Date: July 1, 1992
Creator: Fisher, R. A.; Emerson, J. P.; Phillips, N. E. (Lawrence Berkeley Lab., CA (United States)); Ballou, R. & Lelievre-Berna, E. (Centre National de la Recherche Scientifique (CNRS), 38 - Grenoble (France). Lab. Louis Neel)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Optimization of film synthesized rare earth transition metal permanent magnet systems. Progress report, August 1, 1989--July 1990

Description: This report reviews work on the optimization of film synthesized rare earth transition metal permanent magnet systems. Topics include: high coercivity in Sm-Fe-Ti-V, Sm-Fe-V, and two element systems; ThMn{sub 12} type pseudobinary SmFe{sub 12 {minus} X}T{sub X}; and sputter process control for the synthesis of precisely textured RE-TM magnetic films. (JL)
Date: December 31, 1990
Creator: Cadieu, F. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Properties and Weldability of Materials for Fusion Reactor Applications

Description: Low-activation austenitic stainless steels have been suggested for applications within fusion reactors. The use of these nickel-free steels will help to reduce the radioactive waste management problem after service. one requirement for such steels is the ability to obtain sound welds for fabrication purposes. Thus, two austenitic Fe-Cr-Mn alloys were studied to characterize the welded microstructure and mechanical properties. The two steels investigated were a Russian steel (Fe-11.6Cr19.3Mn-0.1… more
Date: November 15, 1991
Creator: Chin, B. A.; Kee, C. K.; Wilcox, R. C. & Zinkle, S. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Ion implantation effects on surface-mechanical properties of metals and polymers

Description: Fatigue of 8 complex alloys based on Fe-13Cr-15Ni-2Mo-2Mn-0.2Ti-0.8Si- 0.06C, and single-crystal Fe-15Cr-15Ni, implanted with 400-keV B{sup +} and 550-keV N{sup +} (total dose 2.3{times}10{sup 16} ions/cm{sup 2}) was examined. 600 C creep was also examined. The dual implantation increased hardness but decreased fatigue life of the 8 complex alloys. An optimum strengthening level and a shift to grain boundary cracking were determined. The single crystals also showed reduced fatigue life after im… more
Date: April 1, 1993
Creator: Rao, G. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cutting tool study: 21-6-9 stainless steel

Description: The Rocky Flats Plant conducted a study to test cermet cutting tools by performing machinability studies on War Reserve product under controlled conditions. The purpose of these studies was to determine the most satisfactory tools that optimize tool life, minimize costs, improve reliability and chip control, and increase productivity by performing the operations to specified Accuracies. This study tested three manufacturers' cermet cutting tools and a carbide tool used previously by the Rocky F… more
Date: July 29, 1992
Creator: McManigle, A. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Magnetic thin films and nanostructures: Anisotropy, microstructure and their inter-relationship

Description: Magnetic thin films and nanostructure exhibit novel properties and have great technological potential. In particular, developing thin film structures with perpendicular anisotropy, understanding the underlying mechanisms and identifying meaningful microstructure-property relationships in such nanometer scale materials is an ongoing challenge. Here, two different approaches as well as details of the relevant microstructure are presented. 6 refs, 2 figs.
Date: October 1, 1992
Creator: Krishnan, K. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Mechanical behavior and phase stability of NiAl-based shape memory alloys

Description: NiAl-based shape memory alloys (SMAs) can be made ductile by alloying with 100--300 wppm B and 14--20 at.% Fe. The addition of Fe has the undesirable effect that it lowers the temperature (A{sub p}) of the martensite {yields} austenite phase transformation. Fortunately, however, A can be raised by lowering the ``equivalent`` amount of Al in the alloy. In this way a high A{sub p} temperature of {approximately}190 C has been obtained without sacrificing ductility. Furthermore, a recoverable strai… more
Date: December 31, 1993
Creator: George, E. P.; Liu, C. T.; Horton, J. A.; Kunsmann, H.; King, T. & Kao, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Al{sub 70}Pd{sub 21.5}Mn{sub 8.5}: A quasicrystal showing the de haas-van Alphen effect

Description: We have measured the de Haas-van Alphen effect in the icosahedral quasicrystal Al{sub 70}Pd{sub 21.5}Mn{sub 8.5}. We have found two well-defined frequencies with the magnetic field parallel to a five-fold axis, and two different ones with the field parallel to a two-fold axis. On increasing the temperature, the amplitude of the oscillations substantially decreased, suggesting that the carriers have large masses.
Date: July 1, 1995
Creator: Haanappel, E. G.; Kycia, S. W.; Harmon, B. N.; Canfield, P. C.; Goldman, A. I.; Rabson, D. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Investment cast AISI H13 tooling for automotive applications

Description: While many techniques exist for production of soft tooling, for die casting there is limited recent experience with cast tooling. The most common US alloy used for manufacture of die casting tooling is wrought AISI H13. If the performance of the cast material is comparable to the wrought counterpart, the use of investment cast HI 3 tooling directly from patterns made via rapid prototyping is of considerable interest. A metallurgical study of investment cast H13 was conducted to evaluate the mec… more
Date: July 1, 1995
Creator: Maguire, M. C.; Baldwin, M. D.; Hochanadel, P. W. & Edwards, G. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Phase transformation and phonon anomalies in Ni{sub 2}MnGa

Description: Inelastic neutron scattering experiments and transmission electron microscopy have been used to study a single crystal of the Ni{sub 2}MnGa shape memory Hustler alloy in a wide temperature range covering the parent phase (T>T{sub 1}=265 K), a recently discovered pemartensitic (T{sub 1}T>T{sub M}) and martensitic (T<T{sub M}=220 K) phase regions. A temperature-dependent anomaly in the TA{sub 2} phonon dispersion in the parent phase was observed and related to the phase transformations. The prema… more
Date: July 1, 1995
Creator: Zheludev, A.; Shapiro, S.M.; Wochner, P.; Schwartz, A.; Wall, M. & Tanner, L.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Magnetic thin films and nanostructures: Anisotropy, microstructure and their inter-relationship

Description: Magnetic thin films and nanostructure exhibit novel properties and have great technological potential. In particular, developing thin film structures with perpendicular anisotropy, understanding the underlying mechanisms and identifying meaningful microstructure-property relationships in such nanometer scale materials is an ongoing challenge. Here, two different approaches as well as details of the relevant microstructure are presented. 6 refs, 2 figs.
Date: October 1, 1992
Creator: Krishnan, K.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Properties and Weldability of Materials for Fusion Reactor Applications

Description: Low-activation austenitic stainless steels have been suggested for applications within fusion reactors. The use of these nickel-free steels will help to reduce the radioactive waste management problem after service. one requirement for such steels is the ability to obtain sound welds for fabrication purposes. Thus, two austenitic Fe-Cr-Mn alloys were studied to characterize the welded microstructure and mechanical properties. The two steels investigated were a Russian steel (Fe-11.6Cr19.3Mn-0.1… more
Date: November 15, 1991
Creator: Chin, B. A.; Kee, C. K.; Wilcox, R. C. & Zinkle, S. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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