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  • COMPOSITE MATERIALS  (2)
  • INSTRUMENTATION AND PHOTOGRAPHY  (1)
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  • 1
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    High temperature static strain gage alloy development program (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The literature, applicable theory and finally an experimental program were used to identify new candidate alloy systems for use as the electrical resistance elements in static strain gages up to 1250K. The program goals were 50 hours of use in the environment of a test stand gas turbine engine with measurement accuracies equal to or better than 10 percent of full scale for strains up to + or - 2000 microstrain. As part of this effort, a computerized electrical resistance measurement system was constructed for use at temperatures between 300K and 1250K and heating and cooling rates of 250K/min and 10K/min. The two best alloys were an iron-chromium-aluminum alloy and a palladium base alloy. Although significant progress was made, it was concluded that a considerable additional effort would be needed to fully optimize and evaluate these candidate systems.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-174833 , NAS 1.26:174833 , R85-915952-13
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Quaternary and quinary modifications of the eutectic superalloy gamma/gamma prime-delta (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Quaternary modifications and quinary additions from the elements Co, Ti, Mo, W, Re, B, Si, and Ta to the baseline quaternary alloy gamma/gamma prime-delta Ni-19.7 at.% Nb-6.0 at.% Cr-2.5 at.% Al are examined for various concentrations. From modification studies five alloys were chosen for detailed mechanical property characterization: Ni-19.7 Nb-6.0 Cr-2.5 Al-1.0 W; Ni-19.7 Nb-6.0 Cr-2.5 Al-1.0 Mo; Ni-18.6 Nb-6.0 Cr-2.5 Al-0.87 Ti; Ni-20.2 Nb-6.0 Cr-2.5 Al-2.0 Co; and Ni-17.9 Nb-6.0 Cr-2.5 Al-3.0 Ta. It is shown that extensive alloying of the baseline quaternary alloy is possible for elements exhibiting a wide solubility range in both phases, and that limited substitution of W, Mo, Re, Si, and B is possible for elements with restricted solid solubility especially in the delta phase. Improvement of creep rupture strength and cyclic oxidation resistance at 1100 C is discussed.
    Keywords: COMPOSITE MATERIALS
    Type: Conference on In Situ Composites; Sep 02, 1975 - Sep 05, 1975; Bolton Landing, NY
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Conference on In Situ Composites, 2nd, Bolton Landing, N.Y., September 2-5, 1975, Proceedings (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The present collection of papers deals with advances in several areas of interest in in-situ composites. Major areas discussed include solidification and structural control, physical properties, mechanical behavior, stability, environmental response, and development of new metallic and ceramic systems. New evidence about directional solidification in terms of temperature gradients is presented along with solidification rates for successful formation of in-situ composite structures. Much is learned about the factors that control structure in directionally solidified eutectic alloys and the relationship of properties to structure, especially the change in properties as a function of operating environment. Less progress is achieved in the area of physical properties than in the area of mechanical properties. Individual items are announced in this issue.
    Keywords: COMPOSITE MATERIALS
    Type: Conference on In Situ Composites; Sep 02, 1975 - Sep 05, 1975; Bolton Landing, NY
    Format: text
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    NASA TECHNICAL REPORTS
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