In-Situ Alloying of Fe-Si-Al Soft Magnetic Alloys Using Laser Powder Bed Fusion
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Product development (MPPDE), MSc
Publicerad
2024
Författare
Shri Srinivas, Akshay
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Improving efficiency and reducing power losses in electrical machines relies heavily
on the development of advanced soft magnetic materials with optimized properties.
To address this need, we employed in-situ alloying of 5.4% aluminum and 24.6%
iron with Fe-6.5Si using the Laser Powder Bed Fusion (L-PBF) technique. This
specific composition was designed to achieve a balanced set of multi-properties,
including high saturation magnetization, low coercivity, high resistivity, and superior
mechanical strength.
The resulting Fe90.05Si4.55Al5.4 alloy was analyzed through various characterization
techniques to gain insights into its microstructure, crystal structure, as well as its
magnetic and mechanical properties. The analysis revealed a homogeneous alloy
with a single-phase body-centered cubic (BCC) structure. Through microstructure
analysis, it was found that the metal regions was dense with very few cracks whereas
the elemental composition was found to be homogeneous and similar to the nominal
composition in these regions. The alloy exhibited a saturation magnetization of
166 emu/g and a coercivity of 4.7 Oe and found to be magnetically stable upto a
temperature of 900 K. Additionally, a Vickers hardness of 423 HV was measured,
which is significantly higher than that of Fe-3.5Si and Fe-6.5Si.
Beskrivning
Ämne/nyckelord
In-situ alloying , Carbonyl Iron Powder , L-PBF , flowability , characterization