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A Glove Box Enclosed Gas-Tungsten Arc Welding System

Description: This report describes an inert atmosphere enclosed gas-tungsten arc welding system which has been assembled in support of the MC2730, MC2730A and MC 3500 Radioisotope Thermoelectric Generator (RTG) Enhanced Surveillance Program. One goal of this program is to fabricate welds with microstructures and impurity levels which are similar to production heat source welds previously produced at Los Alamos National Laboratory and the Mound Facility. These welds will subsequently be used for high tempera… more
Date: July 1, 1999
Creator: Reece, M. & Robino, C. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fusion welding of advanced borated stainless steels. Final report: CRADA No. CR1042

Description: This work addressed two major areas concerning joining of advanced borated stainless steels. These areas included the development of a understanding of the physical metallurgy of borated stainless steels and the development of welding processes and post-weld heat treatments for these alloys. Differential thermal analysis experiments were conducted on ten heats of borated stainless steel to determine the transformation temperatures and melting behavior of the alloys. On-heating solidus temperatu… more
Date: February 1, 1994
Creator: Robino, C. V. & Cieslak, M. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Design and Testing of Metal and Silicon Heat Spreaders with Embedded Micromachined Heat Pipes

Description: The authors have developed a new type of heat spreader based on the integration of heat pipes directly within a thin planar structure suitable for use as a heat spreader or as the base layer in a substrate. The process uses micromachining methods to produce micron scale patterns that act as a wick in these small scale heat pipes. By using silicon or a low expansion metal as the wall material of these spreaders, they achieve a good match to the thermal coefficient of expansion of the die. The ma… more
Date: February 22, 1999
Creator: Benson, D. A. & Robino, C. V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A Parametric Analysis of Solidification in Y(Fe,Ni,Cr)-Nb-C Alloys

Description: A parametric analysis is presented which summarizes the amount of total ({gamma}/NbC + {gamma}/Laves) and individual {gamma}/NbC and {gamma}/Laves constituents which form during solidification of {gamma}{sub (Fe,Ni,Cr)} alloys with variations in nominal Nb and C contents. Calculated results are presented for Fe base alloys and Ni base alloys. The results provide a quantitative rationale for understanding the relation between alloy composition and solidification microstructures and should provid… more
Date: February 22, 1999
Creator: DuPont, J. N. & Robino, C. V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Metallurgical evaluation of SRAM II/SRAM A programmer base plates

Description: Ten MC4073/4369 programmer base plates were analyzed. This component, a programmer base plate for the SRAM II (and later the SRAM A), is specified as a Grade C quality casting made of aluminum Alloy A356, heat treated to the T6 condition. A concern was expressed regarding the choice of an A356 casting for this application, given the complexity and severity of the loading environment. Preliminary tests and analyses suggested that the design was adequate, but noted the uncertainty involved in a n… more
Date: May 1, 1993
Creator: Damkroger, B. K.; Maguire, M. C. & Robino, C. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Solidification modeling of Nb bearing superalloys

Description: The solidification behavior of experimental Ni base and Fe base superalloys containing Nb, Si, and C was studied using differential thermal analysis (DTA) and microstructural characterization techniques. The solidification reaction sequences responsible for microstructural development were found to be similar to those expected in the Ni-Nb-C ternary system, where the solute-rich interdendritic liquid exhibited two eutectic-type reactions at the terminal stages of solidification: L {yields} ({ga… more
Date: August 1, 1997
Creator: DuPont, J. N.; Marder, A. R. & Robino, C. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Weld Properties of a Free Machining Stainless Steel

Description: The all weld metal tensile properties from gas tungsten arc and electron beam welds in free machining austenitic stainless steels have been determined. Ten heats with sulfur contents from 0.04 to 0.4 wt.% and a wide range in Creq/Nieq ratios were studied. Tensile properties of welds with both processes were related to alloy composition and solidification microstructure. The yield and ultimate tensile strengths increased with increasing Creq/Nieq ratios and ferrite content, whereas the ductility… more
Date: August 1, 2000
Creator: Brooks, J. A.; Goods, S. H. & Robino, C. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modeling solute redistribution and microstructural development in fusion welds of multi-component alloys

Description: Solute redistribution and microstructural evolution have been modeled for gas tungsten arc fusion welds in experimental Ni base superalloys. The multi-component alloys were modeled as a pseudo-ternary {gamma}-Nb-C system. The variation in fraction liquid and liquid composition during the primary L {r{underscore}arrow} {gamma} and eutectic type L {r{underscore}arrow} ({gamma} + NbC) stages of solidification were calculated for conditions of negligible Nb diffusion and infinitely rapid C diffusio… more
Date: December 15, 1999
Creator: Dupont, J. N.; Robino, C. V. & Newbury, B. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Transformation kinetics in controlled-power and controlled-temperature cycle testing

Description: On-heating transformation kinetics were investigated for several steels by using a Gleeble capable of programmable power input as well as programmable temperature cycling. Transformation kinetics determined in both modes are reported. The temperature cycles are significantly different between the two modes due to the latent heat associated with the phase transformations. Both diffusion rates and transformation driving force increase with temperature above the eutectoid temperature, therefore th… more
Date: June 1, 1998
Creator: Robino, C. V.; Knorovsky, G.; Dykhuizen, R. C.; MacCallum, D. O. & Damkroger, B. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of a Weldable Neutron Absorbing Structural Material

Description: The National Spent Nuclear Fuel Program, located at the Idaho National Laboratory, coordinates and integrates national efforts in management and disposal of U.S. Department of Energy (DOE)-owned spent nuclear fuel. These management functions include development of standardized systems for packaging, storage, treatment, transport, and long-term disposal in the proposed Yucca Mountain Repository. Nuclear criticality control measures are needed in these systems to avoid restrictive fissile loading… more
Date: April 1, 2006
Creator: Mizia, R. E.; Hurt, W. L.; Robino, C. V. & DuPont, J. N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Dilatometry in the Gleeble: What did you really measure?

Description: The Gleeble is an oft-used tool for welding metallurgy research. Besides producing synthetic weld specimens, it is used to determine phase transformation temperatures and kinetics via dilatometry. Experimental data and an FEM model are used to examine measured dilatation errors because of non-uniform heating of the dilatometer and other sources such as sample elastic and plastic deformation. Both isothermal and constant heating/cooling rate scenarios are considered. Further errors which may be … more
Date: June 1, 1998
Creator: Knorovsky, G. A.; Robino, C. V.; Dykhuizen, R. C. & MacCallum, D. O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Nickel-based Gadolinium Alloy for Neutron Adsorption Application in Ram Packages

Description: Neutron transmission experiments were performed on samples of an advanced nickel-chromium-molybdenum-gadolinium (Ni-Cr-Mo-Gd) neutron absorber alloy and chromium-nickel (Cr-Ni) stainless steel, modified by the addition of boron. The primary purpose of the experiments was to demonstrate the thermal neutron absorbing capability of the materials at specific gadolinium and boron dopant levels. The Ni-Cr-Mo-Gd alloy is envisioned to be deployed for criticality control of highly enriched U.S. Departm… more
Date: October 1, 2007
Creator: Wachs, Gregg; Sterbentz, James; Hurt, William; McConnell, P. E.; Robino, C. V.; Tovesson, F. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of Neutron Absorbers to Support Disposal of DOE SNF

Description: The National Spent Nuclear Fuel Program, located at the Idaho National Engineering and Environmental Laboratory, coordinates and integrates national efforts in management and disposal of U.S. Department of Energy (DOE)- owned . These management functions include using the DOE standardized canister for packaging, storage, treatment, transport, and long-term disposal. Nuclear criticality control measures are needed in these canisters because of the enrichment and total quantity of fissile materia… more
Date: March 1, 2003
Creator: Hurt, William Lon; Mizia, Ronald Eugene; Lister, T. E.; Pinhero, P. J.; Robino, C. V. & Dupont, J. N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Understanding Thermal Behavior in Lens Processing of Structural Materials

Description: In direct laser metal deposition technologies, such as the Laser (LENS) process, it is important to understand and control the Engineered Net Shaping thermal behavior during fabrication. With this control, components can be reliably fabricated with desired structural material properties. This talk will describe the use of contact and imaging techniques to monitor the thermal signature during LENS processing. Recent results show a direct correlation between thermal history and material propertie… more
Date: November 5, 1998
Creator: Ensz, M. T.; Greene, D. L.; Griffith, M. L.; Harwell, L. D.; Hofmeister, W. H.; Nelson, D. V. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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