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Meeting Materials Science & Technology 2020
Symposium Metallurgy and Magnetism
Presentation Title Magnetic Performance of Gas-atomized Maraging Steel Powders
Author(s) Ganesh Varma Thotakura, Ramasis Goswami, Tanjore V. Jayaraman
On-Site Speaker (Planned) Tanjore V. Jayaraman
Abstract Scope Maraging steels are traditional ultra-high-strength structural alloys prominent in hydrospace and aerospace applications. We evaluated the magnetic performance and properties of gas-atomized maraging steel powder, over a range of temperatures, and compared with commercial semi-hard magnetic alloys. The magnetic properties of the powders were characterized by vibrating sample magnetometry, while the structure by x-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The powders predominantly comprised martensite along with traces of retained-austenite and intermetallic compounds. The powders exhibited the following magnetic behavior at ambient temperature: magnetic saturation (Ms) ~176 Am2/kg, magnetic remanence (Mr) ~1 Am2/kg, coercivity (Hc) ~3 kA/m, and magnetic anisotropy (K1) ~1.8 x 106 J/m3. The Ms, K1, Hc, and Mr increased at sub-ambient temperatures. The magnetic moment per atom (h) of the powder was estimated to be ~1.93 B. With the increase in thermal-treatment temperature, the MS and Hc increased and decreased, respectively, marginally.


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