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in subjects: "Hardness"

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Physical properties of halthane series adhesives, part 2 of 2. Period covered: October--December 1976. [Urethanes: tensile adhesion; bulk viscosity; hardness]

The Halthane series of urethane adhesives have sufficient adhesive strengths and cure times for most assembly processes at Pantex. The efficiency of preparation and handling of the three systems are nearly equal. Physical properties are more consistent between samples for the 87-1. The 73-18 system is ranked in the middle and 73-14 as the least consistent. The 87-1 system is high in viscosity and adhesive bond strength. The low viscosity of 73-18 and 73-14 allows more consistency in bond thickn… more

Date: January 1, 1976

Creator: Lichte, H. W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A design of experiment study of plasma sprayed alumina-titania coatings

An experimental study of the plasma spraying of alumina-titania powder is presented in this paper. This powder system is being used to fabricate heater tubes that emulate nuclear fuel tubes for use in thermal-hydraulic testing. Coating experiments were conducted using a Taguchi fractional-factorial design parametric study. Operating parameters were varied around the typical spray parameters in a systematic design of experiments in order to display the range of plasma processing conditions and t… more

Date: January 1, 1992

Creator: Steeper, T. J. (Du Pont de Nemours (E.I.) and Co., Aiken, SC (United States). Savannah River Lab.); Varacalle, D. J. Jr.; Wilson, G. C. (EG and G Idaho, Inc., Idaho Falls, ID (United States)); Riggs, W. L. II (Tubal Cain Co., Loveland, OH (United States)); Rotolico, A. J. & Nerz, J. E. (Metco/Perkin-Elmer, Westbury, NY (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Collector sealants and breathing. Final Report, 25 September 1978-31 December 1979

The objectives of this program were: (1) to investigate the pertinent properties of a variety of possible sealants for solar collectors and identify the most promising candidates, and (2) to study the effect of breathing in flat-plate, thermal solar collector units. The study involved two types of sealants, Class PS which includes preformed seals or gaskets and Class SC which includes sealing compounds or caulks. It was the intent of the study to obtain data regarding initial properties of cand… more

Date: February 20, 1980

Creator: Mendelsohn, M A; Luck, R M; Yeoman, F A & Navish, Jr, F W

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Embrittlement of the Shippingport reactor shield tank

The irradiation embrittlement of the Shippingport neutron tank material has been characterized. Irradiation increases the Charpy transition temperature (CTT) by {approximately}25{degrees}C (45{degrees}F) and decreases the upper shelf energy. The shift in CTT is not as severe as that observed in the HFIR surveillance specimens. However, the actual value of CTT is higher than that for the HFIR data and the toughness at service temperature is low. The increase in yield stress is 51 MPa (7.4 ksi), … more

Date: October 1, 1989

Creator: Chopra, O. K. & Shack, W. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Low temperature CVD of TaB/sub 2/

Crystalline TaB/sub 2/ has been deposited using the CVD reaction of TaCl/sub 5/ and B/sub 2/H/sub 6/ in the temperature range of 773-1200/sup 0/K. Thermodynamic calculations have been made which compare the use of both B/sub 2/H/sub 6/ and BCl/sub 3/ as B source gases. The deposits obtained with B/sub 2/H/sub 6/ exhibited extremely small crystal size and contained amorphous B when the deposition temperature was below approx. 873/sup 0/K but were substoichiometric in B above this temperature. Ca… more

Date: January 1, 1980

Creator: Randich, E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Mechanical properties and microstructure of pressureless sintered duophase sialon

Duophase ({alpha}{prime}/{beta}{prime}) sialon is being developed for ceramic engine applications by using the Quickset{trademark} injection molding process, followed by pressureless sintering and a thermal treatment. The sialon had an average four-point flexural strength of 670 MPa at room temperature and 490 MPa at 1370{degree}C. It survived the flexural stress rupture test at 1300{degree}C and 340 MPa for 190 hours. X-ray diffraction (XRD) and transmission electron microscopy (TEM) character… more

Date: January 1, 1991

Creator: Lee, Ran-Rong; Novich, B.E.; Franks, G.; Quellette, D. (Ceramics Process Systems Corp., Milford, MA (United States)); Ferber, M.K.; Hubbard, C.R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Study to optimize Cr-Mo steels to resist hydrogen and temper embrittlement

This report gives the results of tests designed to measure the threshold stress intensity (K/sub Iscc/) in H/sub 2/S of the peak hardness zone in the HAZ of welds in 2 1/4 Cr-1 Mo plate. Difficulty was encountered because of a variability in the location of the peak hardness zone relative to the weld-base interface. There are indications that K/sub Iscc/ could be significantly below 80 ksi..sqrt..in but the absolute value could not be determined from the current tests. Details of the forging pr… more

Date: July 1, 1980

Creator: Shaw, B.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Effects of oxide layers on optical properties and x-ray hardness of Al-Be mirrors

Oxide layers form on the surfaces of many metallic mirrors. The oxidation may occur during fabrication or after the mirror is finished and installed. Some oxide layers may be intentionally added to protect the mirror or to change its optical properties. Computer calculations predict the effect of oxide layers on optical and ultraviolet reflectance as well as the x-ray absorption and concomitant thermal damage to the mirrors. 6 refs., 6 figs., 1 tab.

Date: June 11, 1991

Creator: White, R.H. & Wirtenson, G.R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Dynamic shock studies of vanadium

Using gas-gun loading techniques and velocity interferometric techniques, time-resolved wave profiles have been obtained in vanadium over the stress range of 2.9 to 9.7 GPa. The risetime data indicate steepened shock structures with increasing shock amplitude. However, unlike aluminum, finite risetimes are determined even at 9.7 GPa, indicating a large effective viscosity for the material. The dynamic yield strength measured at the Hugoniot elastic limit is 0.8 GPa and is approximately twice th… more

Date: January 1, 1985

Creator: Chhabildas, L.C. & Hills, C.R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Cluster assembly of hierarchical nanostructures

In the past few years, atom clusters with diameters in the range of 2--20 nm of a variety of materials, including both metals and ceramics, have been synthesized by evaporation and condensation in high-purity gases and subsequently consolidated in situ under ultrahigh vacuum conditions to create nanophase materials. These new utlrafine-grained materials have properties that are often significantly different and considerably improved relative to those of their coarser-grained counterparts owing … more

Date: February 1, 1992

Creator: Siegel, R. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Effect of ion implantation on subsequent erosion and wear behavior of solids

The removal of material from a solid surface by mechanical forces is influenced by material properties (hardness, fracture toughness, yield strength, surface free energy) as well as system parameters (force, velocity of loading, environment). Ion implantation can modify many of the material properties either by directly affecting the deformation characteristics or indirectly by affecting the chemical or phase composition at the surface. The various forms of wear and erosion are analyzed to dete… more

Date: January 1, 1985

Creator: McHargue, C.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Characteristics of American coals in relation to their conversion into clean-energy fuels. Final report. [1150 samples of US coals]

To further characterize the Nation's coals, the Penn State Coal Sample Bank and Data Base were expanded to include a total of 1150 coal samples. The Sample Bank includes full-seam channel samples as well as samples of lithotypes, seam benches, and sub-seam sections. To the extent feasible and appropriate basic compositional data were generated for each sample and validated and computerized. These data include: proximate analysis, ultimate analysis, sulfur forms analysis, calorific value, macera… more

Date: June 1, 1982

Creator: Spackman, W.; Davis, A.; Walker, P. L.; Lovell, H. L.; Vastola, F. J.; Given, P. H. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Investigation of cracking on a main steam isolation valve shaft from the Farley Unit No. 1 nuclear power plant

Chemical analysis of the Farley Unit No. 1 MSIV shaft (No. 69C) showed that the chemical composition of the material was consistent with that expected of a Type 410 stainless steel. The microstructure observed in the base metal (tempered martensite) is consistent with that expected in a Type 410 stainless steel in the quenched and tempered condition. The hardness measurements (both R/sub c/ and Knoop) show that the hardness observed (R/sub c/ 41.3 with a KN max of 459) is significantly higher t… more

Date: January 1, 1985

Creator: Czajkowski, C.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Determination of Basic Structure-Property Relations for Processing and Modeling in Advanced Nuclear Fuel: Microstructure Evolution and Mechanical Properties

The project objective is to study structure-property relations in solid solutions of nitrides and oxides with surrogate elements to simulate the behavior of fuels of inert matrix fuels of interest to the Advanced Fuel Cycle Initiative (AFCI), with emphasis in zirconium-based materials. Work with actual fuels will be carried out in parallel in collaboration with Los Alamos National Laboratory (LANL). Three key aspects will be explored: microstructure characterization through measurement of globa… more

Date: March 1, 2009

Creator: Wheeler, Kirk; Parra, Manuel & Peralta, Pedro

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Advanced Integration in Multi-Scale Mechanics and Welding Process Simulation in Weld Integrity Assessment

In this project, mathematical models that predict the microstructure in pipeline steel welds were to be developed. These models were to be integrated with thermal models that describe the time-temperature history in the weld as a function of location in order to derive the spatial variation of microstructure in the weld. The microstructure predictions were also to be combined with microstructure-hardness relations, based on the additivity principle, to determine the spatial variation of hardnes… more

Date: January 30, 2008

Creator: Vitek, J.M.; Wilkowski, G.M.; Brust, F.W. & Babu, S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Low Temperature Surface Carburization of Stainless Steels

Low-temperature colossal supersaturation (LTCSS) is a novel surface hardening method for carburization of austenitic stainless steels (SS) without the precipitation of carbides. The formation of carbides is kinetically suppressed, enabling extremely high or colossal carbon supersaturation. As a result, surface carbon concentrations in excess of 12 at. % are routinely achieved. This treatment increases the surface hardness by a factor of four to five, improving resistance to wear, corrosion, and… more

Date: December 7, 2007

Creator: Collins, Sunniva R.; Heuer, Arthur H. & Sikka, Vinod K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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RADIATION EFFECTS ON EPOXY CARBON FIBER COMPOSITE

Carbon fiber-reinforced bisphenol-A epoxy matrix composite was evaluated for gamma radiation resistance. The composite was exposed to total gamma doses of 50, 100, and 200 Mrad. Irradiated and baseline samples were tested for tensile strength, hardness and evaluated using FTIR (Fourier transform infrared) spectroscopy and DSC (differential scanning calorimetry) for structural changes. Scanning electron microscopy was used to evaluate microstructural behavior. Mechanical testing of the composite… more

Date: May 30, 2008

Creator: Hoffman, E

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Miniature CVD-diamond corning drills for robotic sample collection and analysis.

Coring tools have been used etlectivelv on the Moon, but to date no such tools have been used on any other extraterrestrial surface. The lunar experience includes both manual (Apollo) and robotic (Luna) systems . These coring systems were concerned primarily with acquiring samples from depth for return to Earth or for the creation of instrument emplacement holes (e .g ., heat probes). Current designs for planetary drills differ from the lunar tools primarily in that they are integrated with rob… more

Date: January 1, 2003

Creator: Vaniman, D. T. (David T.); Trava-Airoldi, V.J.; Bish, D. L. (David L.) & Chipera, S. J. (Steve J.)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Evaluation of the transgranular cracking phenomenon on the Indian Point No. 3 steam generator vessels

A metallurgical investigation was performed on specimens from the shell of steam generators Nos. 31 and 32 of the Indian Point-3 Power Plant. The shell material exhibited high values in hardness which was indicative that relatively high residual stresses may have been present. All observed cracks were transgranular in appearance and were associated with pits on the vessels' inside surfaces. Both stress relieved and non-stress relieved specimens of SA302 Grade B material were tested in a constan… more

Date: January 1, 1985

Creator: Czajkowski, C.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Properties of SYNROC-D nuclear waste form: a state-of-the-art reivew

SYNROC is a titanate-based ceramic waste form being developed to immobilize high-level nuclear reactor wastes. SYNROC-D is a unique variation of SYNROC designed to contain high-level defense wastes, particularly those in storage at the Savannah River Plant (SRP). In this report, we review results from physical property and performance tests on SYNROC-D containing simulated SRP wastes. These results provide a data base for comparing SYNROC-D with other defense waste forms. The test data are grou… more

Date: January 1, 1982

Creator: Campbell, J.; Hoenig, C.; Bazan, F.; Ryerson, F.; Guinan, M.; Van Konynenburg, R. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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US/French Joint Research Program regarding the behavior of polymer base materials subjected to beta radiation. Volume 1. Phase-1 normalization results

As part of the ongoing multi-year joint NRC/CEA international cooperative test program to investigate the dose-damage equivalence of gamma and beta radiation on polymer base materials, dosimetry and ethylene-propylene rubber (EPR) specimens were exchanged, irradiated, and evaluated for property changes at research facilities in the US (Sandia National Laboratories) and France (Compagnie ORIS Industrie). The purpose of this Phase-1 test series was to normalize and cross-correlate the results obt… more

Date: June 1, 1986

Creator: Wyant, F.J.; Buckalew, W.H.; Chenion, J.; Carlin, F.; Gaussens, G.; Le Tutour, P. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Selection and durability of seal materials for a bedded salt repository: preliminary studies

This report details preliminary results of both experimental and theoretical studies of cementitious seal materials for use in a proposed nuclear waste repository in bedded salt. Effects of changes in bulk composition and environment upon phase stability and physical/mechanical properties have been evaluated for more than 25 formulations. Bonding and interfacial characteristics of the region between host rock and seal material or concrete aggregate and cementitious matrix for selected formulati… more

Date: November 1, 1983

Creator: Roy, D. M.; Grutzeck, M. W. & Wakeley, L. D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Isotherms for the uranium-hydrogen system at temperatures of 700 to 1065/sup 0/C and pressures to 137. 89 MPa

Pressure vs composition (P-C) isotherms for the UH system for temperatuers of 700 to 1065/sup 0/C and pressures to 137.89 MPa are shown. The sample was contained in a vessel concentric and located within a secondary vessel. Plateau pressure at 1065/sup 0/C is 700 atm. The single-phase region on the hydrogen-rich side starts at a H/U ratio of 2.35. Physical property measurements showed a thermal conductivity, k, value of 0.003 cal/cm sec K, R/sub c/ = 50. Experimentally determined plateau pressu… more

Date: June 25, 1985

Creator: Lakner, J. F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Novel hard metal compositions and properties. [B/sub 4/C-W-Ni-Fe; B/sub 4/C-Mo-Ni-Fe]

A new family of hard metal compositions consisting primarily of borides, borpcarbides and carbides of nickel, iron and tungsten or molybdenum is made by reaction with small quantities of boron carbide. The hardness of these compositions is in the range of the hardest conventional tungsten carbide-cobalt compositios. Denisty of this family of materials can be varied from about 8 to 17 Mg/m/sup 3/ with only slight variations in hardness. Preliminary data on hot hardness, hardness, fracture toughn… more

Date: January 1, 1983

Creator: Sheinberg, H.

Item Type: Report

Partner: UNT Libraries Government Documents Department