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  • 1980-1984  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Oxidation and hot corrosion of coated and bare oxide dispersion strengthened superalloy MA-755E (1981)
    Springer
    Oxidation of metals 15 (1981), S. 251-276 
    Details
    ISSN: 1573-4889
    Keywords: oxide dispersion strengthening ; oxidation ; hot corrosion ; powder metallurgy ; porosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Cyclic hot corrosion and oxidation testing of an experimental oxide dispersion strengthened (ODS) superalloy MA-755E were conducted in a hot gas stream at Mach 0.3. The response of the ODS alloy, bare or with protective coatings, was similar to that of a conventional cast alloy, IN-792, in hot corrosion at 900°C. However, during oxidation at 1100 and 1150°C the ODS alloy differed from the cast alloy by developing a greater amount of subsurface porosity. Compared with a diffused aluminide coating, an electron beam vapor deposited NiCrAlY coating offered superior oxidation protection and decreased porosity formation. In additional testing, the tendency to form porosity was associated with the large grains of recrystallized powder metallurgy alloys but was independent of the presence of an oxide dispersion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01058828
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Unknown
    Oxidation and hot corrosion of coated and bare oxide dispersion strengthened superalloy MA-755E (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Cyclic hot corrosion and oxidation of an experimental oxide dispersion strengthened (ODS) superalloy MA-755E were conducted in a hot gas stream at Mach 0.3. The response of the ODS alloy, bare or with protective coatings, was similar to that of a conventional cast alloy, IN-792, in hot corrosion at 900 C. However, during oxidation at 1100 and 1150 C the ODS alloy differed from the cast alloy by developing a greater amount of subsurface porosity. Compared with a diffused aluminide coating, an electron beam vapor deposited NiCrAlY coating offered superior oxidation protection and decreased porosity formation. In additional testing, the tendency to form porosity was associated with the large grains of recrystallized powder metallurgy alloys but was independent of the presence of an oxide dispersion.
    Keywords: METALLIC MATERIALS
    Type: Oxidation of Metals; 15; Apr. 198
    Format: text
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  • 3
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    Experimental and theoretical deposition rates from salt-seeded combustion gases of a Mach 0.3 burner rig (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Deposition rates on platinum-rhodium cylindrical collectors rotating in the cross streams of the combustion gases of a salt-seeded Mach 0.3 burner rig were determined. The collectors were internally air cooled so that their surface temperatures could be widely varied while they were exposed to constant combustion gas temperatures. The deposition rates were compared with those predicted by the chemically frozen boundary layer (CFBL) computer program, which is based on multicomponent vapor transport through the boundary layer. Excellent agreement was obtained between theory and experiment for the NaCl-seeded case, but the agreement lessened as the seed was changed to synthetic sea salt, NaNO3, and K2SO4, respectively, and was particularly poor in the case of Na2SO4. However, when inertial impaction was assumed to be the deposition mechanism for the Na2SO4 case, the predicted rates agreed well with the experimental rates. The former were calculated from a mean particle diameter that was derived from the measured intial droplet size distribution of the solution spray. Critical experiments showed that liquid phase deposits were blown off the smooth surface of the platinum-rhodium collectors by the aerodynamic shear forces of the high-velocity combustion gases but that rough or porous surfaces retained their liquid deposits.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TP-2225 , E-1752 , NAS 1.60:2225
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Deposition and material response from Mach 0.3 burner rig combustion of SRC 2 fuels (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Collectors at 1173K (900 C) were exposed to the combustion products of a Mach 0.3 burner rig fueled with various industrial turbine liquid fuels from solvent refined coals. Four fuels were employed: a naphtha, a light oil, a wash solvent and a mid-heavy distillate blend. The response of four superalloys (IN-100, U 700, IN 792 and M-509) to exposure to the combustion gases from the SRC-2 naphtha and resultant deposits was also determined. The SRC-2 fuel analysis and insights obtained during the combustion experience are discussed. Particular problems encountered were fuel instability and reactions of the fuel with hardware components. The major metallic elements which contributed to the deposits were copper, iron, chromium, calcium, aluminum, nickel, silicon, titanium, zinc, and sodium. The deposits were found to be mainly metal oxides. An equilibrium thermodynamic analysis was employed to predict the chemical composition of the deposits. The agreement between the predicted and observed compounds was excellent. No hot corrosion was observed. This was expected because the deposits contained very little sodium or potassium and consisted mainly of the unreactive oxides. However, the amounts of deposits formed indicated that fouling is a potential problem with the use of these fuels.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-81634 , E-647 , DOE/NASA/2593-20
    Format: application/pdf
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  • 5
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    Material response from Mach 0.3 burner rig combustion of a coal-oil mixture (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Wedge shaped specimens were exposed to the combustion gases of a Mach 0.3 burner rig fueled with a mixture of 40 weight percent micron size coal particles dispersed in No. 2 fuel oil. Exposure temperature was about 900 C and the test duration was about 44 one hour cycles. The alloys tested were the nickel base superalloys, IN-100, U-700 and IN-792, and the cobalt base superalloy, Mar-M509. The deposits on the specimens were analyzed and the extent of corrosion/erosion was measured. The chemical compositions of the deposits were compared with the predictions from an equilibrium thermodynamic analysis. The experimental results were in very good agreement with the predictions.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-81686 , DOE/NASA/2593-23 , E-718
    Format: application/pdf
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  • 6
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    Deposition of Na2SO4 from salt-seeded combustion gases of a high velocity burner rig (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The mechanism of deposition of Na2SO4 was studied under controlled laboratory conditions and the results have been compared to a recently developed comprehensive theory of vapor deposition. Thus Na2SO4, NaCl, NaNO3 and simulated sea salt solutions were injected into the combustor of a nominal Mach 0.3 burner rig burning jet fuel at constant fuel/air ratios. The deposits formed on inert collectors, rotation in the cross flow of the combustion gases, were weighed and analyzed. Collector temperature was uniform and could be varied over a large range by internal air cooling. Deposition rates and dew point temperatures were determined. Supplemental testing included droplet size measurements of the atomized salt solutions. These tests along with thermodynamic and transport calculations were utilized in the interpretation of the deposition results.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-83751 , E-2237 , NAS 1.15:83751 , TMS-AIME Fall Meeting; Sep 17, 1984 - Sep 19, 1984; Detroit, MI; United States
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  • 7
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    The effects of trace impurities in coal-derived liquid fuels on deposition and accelerated high temperature corrosion of cast superalloys (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The effects of trace metal impurities in coal-derived liquids on deposition, high temperature corrosion and fouling were examined. Alloys were burner rig tested from 800 to 1100 C and corrosion was evaluated as a function of potential impurities. Actual and doped fuel test were used to define an empirical life prediction equation. An evaluation of inhibitors to reduce or eliminate accelerated corrosion was made. Barium and strontium were found to limit attack. Intermittent application of the inhibitors or silicon additions were found to be effective techniques for controlling deposition without losing the inhibitor benefits. A computer program was used to predict the dew points and compositions of deposits. These predictions were confirmed in deposition test. The potential for such deposits to plug cooling holes of turbine airfoils was evaluated. Tests indicated that, while a potential problem exists, it strongly depended on minor impurity variations.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-81678 , DOE/NASA/2593-22 , Ann. Intern. Gas Turbine Conf.; Mar 08, 1981 - Mar 12, 1981; Houston, TX; United States
    Format: application/pdf
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