Superalloy microstructural variations induced by gravity level during directional solidification
Journal Article
·
· Metall. Trans., A; (United States)
The 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. 6 references.
- Research Organization:
- NASA, Marshall Space Flight Center, Huntsville, AL
- OSTI ID:
- 5635762
- Journal Information:
- Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 16A; ISSN MTTAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CARBIDES
CARBON COMPOUNDS
CRYSTAL STRUCTURE
CRYSTALS
DENDRITES
HAFNIUM ALLOYS
HAFNIUM CARBIDES
HAFNIUM COMPOUNDS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
MATERIALS
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
PHASE TRANSFORMATIONS
REFRACTORY METAL COMPOUNDS
SOLIDIFICATION
TRANSITION ELEMENT COMPOUNDS
WEIGHTLESSNESS
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CARBIDES
CARBON COMPOUNDS
CRYSTAL STRUCTURE
CRYSTALS
DENDRITES
HAFNIUM ALLOYS
HAFNIUM CARBIDES
HAFNIUM COMPOUNDS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
MATERIALS
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
PHASE TRANSFORMATIONS
REFRACTORY METAL COMPOUNDS
SOLIDIFICATION
TRANSITION ELEMENT COMPOUNDS
WEIGHTLESSNESS