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Laser Additive Manufacturing of Magnetic Materials

A matrix of variably processed Fe-30at%Ni was deposited with variations in laser travel speeds as well and laser powers. A complete shift in phase stability occurred as a function of varying laser travel speed. At slow travel speeds, the microstructure was dominated by a columnar fcc phase. Intermediate travel speeds yielded a mixed microstructure comprised of both the columnar fcc and a martensite-like bcc phase. At the fastest travel speed, the microstructure was dominated by the bcc phase. This shift in phase stability subsequently affected the magnetic properties, specifically saturation magnetization. Ni-Fe-Mo and Ni-Fe-V permalloys were deposited from an elemental blend of powders as well. Both systems exhibited featureless microstructures dominated by an fcc phase. Magnetic measurements yielded saturation magnetizations on par with conventionally processed permalloys, however coercivities were significantly larger; this difference is attributed to microstructural defects that occur during the additive manufacturing process.

Identiferoai:union.ndltd.org:unt.edu/info:ark/67531/metadc1011873
Date08 1900
CreatorsMikler, Calvin V.
ContributorsBanerjee, Rajarshi, 1972-, Scharf, Thomas W., Williams, J. C. (James Case), 1938-
PublisherUniversity of North Texas
Source SetsUniversity of North Texas
LanguageEnglish
Detected LanguageEnglish
TypeThesis or Dissertation
Formatviii, 64 pages, Text
RightsPublic, Mikler, Calvin V., Copyright, Copyright is held by the author, unless otherwise noted. All rights Reserved.

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