Influence of energy density on the microstructure, growth orientation, and anisotropy of magnetic properties in additively manufactured Fe-3.8wt%Si transformer steels
Journal article, 2023

Fe-3.8wt%Si transformer steels were processed using two different additive manufacturing (AM) techniques, laser powder bed fusion (LPBF) and directed energy deposition (DED). While the LPBF processed samples exhibited a strong <001> orientation of the BCC grains along the build axis, the DED processed samples exhibited a randomized texture along the build axis. DED processed samples showed substantially coarser columnar grains as compared to their LPBF counterparts. The columnar grains exhibited a substantial number of low-angle sub-grain boundaries. All samples exhibited very good soft magnetic properties, with saturation magnetization (Ms) values ranging from 205 - 232 emu/gm, and coercivity (Hc) values ranging from 1.2 – 4.2 Oe. The Coercivity (Hc) values were significantly lower when the magnetic field was applied parallel to the build axis, as compared to being perpendicular, which can be rationalized based on the columnar nature of the grains, resulting in a higher number density of grain boundaries in case of the field applied perpendicular to the build axis.

Laser additive manufacturing

Laser powder bed fusion

Iron-silicon electric steels

Magnetic properties

Direct energy deposition

Author

S. M. Varahabhatla

University of North Texas

M. S.K.K.Y. Nartu

University of North Texas

Pacific Northwest National Laboratory

S. A. Mantri

University of North Texas

Varun Chaudhary

Chalmers, Industrial and Materials Science, Materials and manufacture

K. V.Mani Krishna

University of North Texas

S. S. Joshi

University of North Texas

R. V. Ramanujan

Nanyang Technological University

N. B. Dahotre

University of North Texas

Rajarshi Banerjee

University of North Texas

Materialia

25891529 (eISSN)

Vol. 30 101854

Areas of Advance

Production

Subject Categories

Metallurgy and Metallic Materials

DOI

10.1016/j.mtla.2023.101854

More information

Latest update

1/3/2024 9