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Superalloy microstructural variations induced by gravity level during directional solidificationThe Ni-base superalloy MAR-M246 (Hf) was directionally solidified during low gravity maneuvers aboard a NASA KC-135 aircraft. Gravity force variations during this process yielded a concomitant variation in microstructure and microsegregation. Secondary dendrite arm spacings are noted to be larger in the low-g portion; this, in turn, decreases the extent of interdendritic segregation. The amount of Hf in both the carbides and interdendritic eutectic increases as the gravity force diminishes. Fewer carbides are present in the low-g regions.
Document ID
19850066123
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Johnston, M. H.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Curreri, P. A.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Parr, R. A.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Alter, W. S.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 12, 2013
Publication Date
September 1, 1985
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 16A
ISSN: 0360-2133
Subject Category
Metallic Materials
Accession Number
85A48274
Distribution Limits
Public
Copyright
Other

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