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  • Other Sources  (3)
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  • 1
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    Unknown
    The effects of temperature gradient and growth rate on the morphology and fatigue properties of MAR-M246(Hf) (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: MAR-M246(Hf) is a nickel based superalloy used in the turbopump blades of the Space Shuttle main engines. The effects are considered of temperature gradient (G) and growth rate (R) on the microstructure and fatigue properties of this superalloy. The primary dendrite arm spacings were found to be inversely proportional to both temperature gradient and growth rate. Carbide and gamma - gamma prime morphology trends were related to G/R ratios. Weibull analysis of fatigue results shows the characteristic life to be larger by a factor of 10 for the low gradient/fast rate pairing of G and R, while the reliability (beta) was lower.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-100374 , NAS 1.15:100374
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Conditions Of Directional Solidification Affect Superalloy (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Report describes experiments to determine effects of gradient of temperature and rate of solidification on microstructure and fatigue properties of nickel-based superalloy MAR-M246(Hf). Enhancement of properties extends lifespans of objects, including turbo-pump blades of Space Shuttle Main Engines. Results indicate significant improvements in fatigue properties derived through manipulation of parameters of directional solidification. Particularly MAR-M246(Hf) for turbine blades contains small, well-dispersed blocky carbide and microstructure with small distances between dendrite arms, and without eutectic phase.
    Keywords: MATERIALS
    Type: MFS-27231 , NASA Tech Briefs (ISSN 0145-319X); 16; 11; P. 88
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Effect Of Solidification Speed On Fatigue Properties (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Fast solidification increases fatigue life, but failure distribution becomes less predictable. Report describes effects of rate of solidification on nickel-based super-alloy MAR-M246(Hf) used in turbine blades. Based on experiments in which specimens directionally solidified at 5 cm/h and 30 cm/h, then tested for high cycle fatigue. Specimens also inspected by energy-dispersive x-ray (EDX) analysis and optical and electron microscopy.
    Keywords: MATERIALS
    Type: MFS-27215 , NASA Tech Briefs (ISSN 0145-319X); 13; 6; P. 67
    Format: text
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    NASA TECHNICAL REPORTS
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