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Conditions Of Directional Solidification Affect SuperalloyReport 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.
Document ID
19920000693
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Schmidt, D. D.
(NASA Marshall Space Flight Center, Huntsville, AL.)
Alter, W. S.
(NASA Marshall Space Flight Center, Huntsville, AL.)
Hamilton, W. D.
(NASA Marshall Space Flight Center, Huntsville, AL.)
Parr, R. A.
(NASA Marshall Space Flight Center, Huntsville, AL.)
Date Acquired
August 15, 2013
Publication Date
November 1, 1992
Publication Information
Publication: NASA Tech Briefs
Volume: 16
Issue: 11
ISSN: 0145-319X
Subject Category
Materials
Report/Patent Number
MFS-27231
Accession Number
92B10693
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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