NDLI: Influence of a magnetic field during directional solidification of mar-m 246 + hf superalloy

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Influence of a magnetic field during directional solidification of mar-m 246 + hf superalloy

Content Provider	NASA Technical Reports Server (NTRS)
Author	Alter, Wendy Schmidt, Dianne Andrews, J. Barry
Copyright Year	1991
Description	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-135 high-g, low-g maneuvers.
File Size	2703106
Page Count	59
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19910013103
Archival Resource Key	ark:/13960/t77t2m83d
Language	English
Publisher Date	1991-01-01
Access Restriction	Open
Subject Keyword	Metallic Materials Directional Solidification Crystals Microanalysis Magnetic Effects Optimization Concentration Composition Eutectics Heat Resistant Alloys Surface Properties C-135 Aircraft Magnetic Fields Microstructure Microgravity Carbides Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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