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  • 1
    facet.materialart.
    Unknown
    Elevated temperature strengthening of a melt spun austenitic steel by TiB2 (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Mechanical properties of an iron-based alloy containing (by wt pct) 33Ni, 2Al, 6Ti, and 2B (resulting in an alloy containing 10 vol pct TiB2) were evaluated by hardness and tensile testing. The alloy was cast as a ribbon using a dual 'free-jet' variation of Jech et al. (1984) method of chill-block melt-spinning against a copper wheel; to simulate thermal cycles the alloy ribbon would experience during compaction into shapes, various segments of the ribbon were annealed under a vacuum at temperatures ranging from 500 to 1150 C. The results show that maximum strengths at 650 and 760 C were developed in ribbons annealed at 1100 C; in these ribbons an optimal combination of grain coarsening with minimum TiB2 particle growth was observed. However, the elevated-temperature strength of the TiB2-strengthened alloy under optimal annealing conditions was poorer than that of conventional iron-based superalloys strengthened by gamma-prime precipitates.
    Keywords: METALLIC MATERIALS
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  • 2
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    Elevated temperature flow strength, creep resistance and diffusion welding characteristics of Ti-6Al-2Nb-1Ta-0.8Mo (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A study of the flow strength, creep resistance and diffusion welding characteristics of the titanium alloy Ti-6Al-2Nb-1Ta-0.8Mo has been conducted. Two mill-processed forms of this alloy were examined. The forged material had been processed above the beta transus (approximately 1275 K) while the rolled form had been subjected to work below the beta transus. Between 1150 and 1250 K, the forged material was stronger and more creep resistant than the rolled alloy. Both forms exhibit superplastic characteristics in this temperature range. Strain measurements during diffusion welding experiments at 1200 K reveal that weld interfaces have no measurable effect on the overall creep deformation. Significant deformation appears to be necessary to produce a quality diffusion weld between superplastic materials. A 'soft' interlayer inserted between faying surfaces would seemingly allow manufacture of quality diffusion welds with little overall deformation.
    Keywords: METALLIC MATERIALS
    Type: Metallurgical Transactions A - Physical Metallurgy and Materials Science; 10A; Nov. 197
    Format: text
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  • 3
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    Rapid solidification via melt spinning - Equipment and techniques (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: One of the simpler methods available to accomplish rapid solidification processing is free jet melt spinning. With only a modest expenditure of time, effort, and capital, an apparatus suitable for preliminary experimentation can be assembled. Wheel and crucible materials, process atmospheres, crucible design, heating methods, and process parameters and their relationship to melt composition are described. Practical solutions to processing problems, based on 'hands-on' experience, are offered. Alloys with melting points up to 3000 F have been rapidly solidified using the techniques described.
    Keywords: METALLIC MATERIALS
    Type: Journal of Metals (ISSN 0148-6608); 36; 41-45
    Format: text
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  • 4
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    Diffusion welding of MA 6000 and a conventional nickel-base superalloy (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A feasibility study of diffusion welding the oxide dispersion strengthened (ODS) alloy MA 6000 to itself and to conventional Ni-base superalloy Udimet 700 was conducted. Butt joints between MA 6000 pieces and lap joints between Udimet 700 and the ODS alloy were produced by hot pressing for 1.25 hr at temperatures ranging from 1000 to 1200 C (1832-2192 F) in vacuum. Following pressing, all weldments were heat treated and machined into mechanical property test specimens. While three different combinations of recrystallized and unrecrystallized MA 6000 butt joints were produced, the unrecrystallized to unrecrystallized joint was most successful as determined by mechanical properties and microstructural examination. Failure to weld the recrystallized material probably related to a lack of adequate deformation at the weld interface. While recrystallized MA 6000 could be diffusion welded to Udimet 700 in places, complete welding over the entire lap joint was not achieved, again due to the lack of sufficient deformation at the faying surfaces. Several methods are proposed to promote the intimate contact necessary for diffusion welding MA 6000 to itself and to superalloys.
    Keywords: METALLIC MATERIALS
    Type: Welding Journal, Research Supplement (ISSN 0043-2296); 64; 219-s to
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  • 5
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    Creep behavior of niobium alloy PWC-11 (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The high vacuum creep and creep-rupture behavior of a Nb-1Zr-.1C alloy (PWC 11) was investigated at 1350 and 1400 K with an applied stress of 40 MPa. The material was tested in the following four conditions: annealed (1 hr 1755 K/2 hr 1475 K); annealed plus EB welded; annealed plus aged for 1000 hr at 1350 or 1400 K; and annealed, welded, and aged. It was found that the material in the annealed state was the most creep-resistant condition tested, and that aging the alloy for 1000 hr without an applied stress greatly reduced that strength; however, it was still approximately three times as creep resistant as Nb-1Zr. Additionally, the EB weld region was stronger than the base metal in each condition tested, and phase extraction of the dispersed precipitate revealed the presence of a 70%ZrC-30%NbC cubic monocarbide phase.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-89834 , DOE/NASA/16310-3 , E-3306 , NAS 1.15:89834
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  • 6
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    The effect of electron beam welding on the creep rupture properties of a Nb-Zr-C alloy (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Creep rupture tests of electron beam welded PWC-11 sheet were conducted at 1350 K. Full penetration, single pass welds were oriented transverse to the testing direction in 1 mm thick sheet. With this orientation, stress was imposed equally on the base metal, weld metal, and heat-affected zone. Tests were conducted in both the postweld annealed and aged conditions. Unwelded specimens with similar heat treatments were tested for comparative purposes. It was found that the weld region is stronger than the base metal for both the annealed and aged conditions and that the PWC-11 material is stronger in the annealed condition than in the aged condition.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-88892 , E-3308 , DOE/NASA/16310-1 , NAS 1.15:88892
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  • 7
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    Preliminary study of niobium alloy contamination by transport through helium (1987)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Transport of gaseous contaminants through the working fluid to or from sensitive refractory alloys is theoretically possible during long time operation of Brayton and Stirling space power generation systems which use a gas as the working fluid. A test was designed which could give an answer to whether transport of contaminants through the working fluid was a potential major problem. The findings of that preliminary study are summarized.
    Keywords: METALLIC MATERIALS
    Type: New Mexico Univ., Transactions of the Fourth Symposium on Space Nuclear Power Systems; p 103-106
    Format: text
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  • 8
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    Elevated-temperature flow strength, creep resistance and diffusion welding characteristics of Ti-gAl-2Nb-1Ta-0.8Mo (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A study of the flow strength, creep resistance and diffusion welding characteristics of the titanium alloy Ti-6Al-2Nb-1Ta-0.8Mo was conducted. Two mill-processed forms of this alloy were examined. The forged material was essentially processed above the beta transus while the rolled form was subjected to considerable work below the beta transus. Between 1150 and 1250 K, the forged material was stronger and more creep resistant than the rolled alloy. Both forms exhibit superplastic characteristics in this temperature range. Strain measurements during diffusion welding experiments at 1200 K reveal that weld interfaces have no measurable effect on the overall creep deformation. Significant deformation appears to be necessary to produce a quality diffusion weld between superplastic materials. A 'soft' interlayer inserted between faying surfaces would seemingly allow manufacture of quality diffusion welds with little overall deformation.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-73854 , E-9441
    Format: application/pdf
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  • 9
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    Solid state welding processes for an oxide dispersion strengthened nickel-chromium-aluminum alloy (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Solid-state welding processes were evaluated for joining TD-NiCrAl (Ni-16Cr-4Al-2ThO2) alloy sheet. Both hot-press and resistance spot welding techniques were successfully applied in terms of achieving grain growth across the bond line. Less success was achieved with a resistance seam welding process. In stress-rupture shear and tensile shear tests of lap joints at 1100 C, most failures occurred in the parent material, which indicates that the weld quality was good and that the welds were not a plane of weakness. The overall weld quality was not as good as previously attained with TD-NiCr, probably because the presence of alumina at the faying surfaces and the developmental TD-NiCrAl sheet, which was not of the quality of the TD-NiCr sheet in terms of surface flatness and dimensional control.
    Keywords: METALLIC MATERIALS
    Type: NASA-TN-D-7915 , E-8144
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  • 10
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    The use of ion beam cleaning to obtain high quality cold welds with minimal deformation (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A variation of cold welding is described which utilizes an ion beam to clean mating surfaces prior to joining in a vacuum environment. High quality solid state welds were produced with minimal deformation.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-78933 , E-9676 , Natl. Technical Conf.; Oct 17, 1978 - Oct 19, 1978; NY; United States
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