Influence of a magnetic field during directional solidification of MAR-M 246 + Hf superalloy. Final Technical Report
Technical Report
·
OSTI ID:5567775
An area that has been almost totally overlooked in the optimization of properties in directionally solidified superalloys is the control of microstructural features through the application of a magnetic field during solidification. The influence of a magnetic field on the microstructural features of a nickel-base superalloys is investigated. Studies were performed on the dendritic MAR-M 246+Hf alloy, which was solidified under both a 5 K gauss magnetic field and under no-applied-field conditions. The possible influences of the magnetic field on the solidification process were observed by studying variations in microstructural features including volume fraction, surface area, number, and shape of the carbide particles. Stereological factors analyzed also included primary and secondary dendrite arm spacing and the volume fraction of the interdendritic eutectic constituent. Microprobe analysis was performed to determine the chemistry of the carbides, dendrites, and interdendritic constituents, and how it varied between field and no-field solidification samples. Experiments involving periodic application and removal of the magnetic field were also performed in order to permit a comparison with structural variations observed in a MAR-M 246+Hf alloy solidified during KC{sup {minus}135} high-g, low-g maneuvers.
- Research Organization:
- Alabama Univ., Birmingham, AL (United States)
- OSTI ID:
- 5567775
- Report Number(s):
- N-91-22416; NASA-CR--184114; NAS--1.26:184114; CNN: NAS8-36461
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY-MAR-M246
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
CHROMIUM ALLOYS
COBALT ALLOYS
CRYSTAL STRUCTURE
DATA
DOCUMENT TYPES
EUTECTICS
EXPERIMENTAL DATA
HAFNIUM ADDITIONS
HAFNIUM ALLOYS
INFORMATION
MAGNETIC FIELDS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NUMERICAL DATA
PHASE TRANSFORMATIONS
PROGRESS REPORT
SOLIDIFICATION
SURFACE PROPERTIES
TANTALUM ALLOYS
TITANIUM ALLOYS
TUNGSTEN ALLOYS
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY-MAR-M246
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
CHROMIUM ALLOYS
COBALT ALLOYS
CRYSTAL STRUCTURE
DATA
DOCUMENT TYPES
EUTECTICS
EXPERIMENTAL DATA
HAFNIUM ADDITIONS
HAFNIUM ALLOYS
INFORMATION
MAGNETIC FIELDS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NUMERICAL DATA
PHASE TRANSFORMATIONS
PROGRESS REPORT
SOLIDIFICATION
SURFACE PROPERTIES
TANTALUM ALLOYS
TITANIUM ALLOYS
TUNGSTEN ALLOYS