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Title: Characterization of the Fe-Co-1.5V soft ferromagnetic alloy processed by Laser Engineered Net Shaping (LENS)

Processing of the low workability Fe-Co-1.5V (Hiperco® equivalent) alloy is demonstrated using the Laser Engineered Net Shaping (LENS) metals additive manufacturing technique. As an innovative and highly localized solidification process, LENS is shown to overcome workability issues that arise during conventional thermomechanical processing, enabling the production of bulk, near net-shape forms of the Fe-Co alloy. Bulk LENS structures appeared to be ductile with no significant macroscopic defects. Atomic ordering was evaluated and significantly reduced in as-built LENS specimens relative to an annealed condition, tailorable through selection of processing parameters. Fine equiaxed grain structures were observed in as-built specimens following solidification, which then evolved toward a highly heterogeneous bimodal grain structure after annealing. The microstructure evolution in Fe-Co is discussed in the context of classical solidification theory and selective grain boundary pinning processes. In conclusion, magnetic properties were also assessed and shown to fall within the extremes of conventionally processed Hiperco® alloys.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [1] ;  [1] ;  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Material, Physical, and Chemical Sciences Center
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Engineering Sciences Center
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Microsystems Science, Technology and Components
Publication Date:
Report Number(s):
SAND2018-2501J
Journal ID: ISSN 2214-8604; 661265
Grant/Contract Number:
AC04-94AL85000; NA0003525
Type:
Accepted Manuscript
Journal Name:
Additive Manufacturing
Additional Journal Information:
Journal Volume: 21; Journal Issue: C; Journal ID: ISSN 2214-8604
Publisher:
Elsevier
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1426795

Kustas, Andrew B., Susan, Donald F., Johnson, Kyle L., Whetten, Shaun R., Rodriguez, Mark A., Dagel, Daryl J., Michael, Joseph R., Keicher, David M., and Argibay, Nicolas. Characterization of the Fe-Co-1.5V soft ferromagnetic alloy processed by Laser Engineered Net Shaping (LENS). United States: N. p., Web. doi:10.1016/j.addma.2018.02.006.
Kustas, Andrew B., Susan, Donald F., Johnson, Kyle L., Whetten, Shaun R., Rodriguez, Mark A., Dagel, Daryl J., Michael, Joseph R., Keicher, David M., & Argibay, Nicolas. Characterization of the Fe-Co-1.5V soft ferromagnetic alloy processed by Laser Engineered Net Shaping (LENS). United States. doi:10.1016/j.addma.2018.02.006.
Kustas, Andrew B., Susan, Donald F., Johnson, Kyle L., Whetten, Shaun R., Rodriguez, Mark A., Dagel, Daryl J., Michael, Joseph R., Keicher, David M., and Argibay, Nicolas. 2018. "Characterization of the Fe-Co-1.5V soft ferromagnetic alloy processed by Laser Engineered Net Shaping (LENS)". United States. doi:10.1016/j.addma.2018.02.006.
@article{osti_1426795,
title = {Characterization of the Fe-Co-1.5V soft ferromagnetic alloy processed by Laser Engineered Net Shaping (LENS)},
author = {Kustas, Andrew B. and Susan, Donald F. and Johnson, Kyle L. and Whetten, Shaun R. and Rodriguez, Mark A. and Dagel, Daryl J. and Michael, Joseph R. and Keicher, David M. and Argibay, Nicolas},
abstractNote = {Processing of the low workability Fe-Co-1.5V (Hiperco® equivalent) alloy is demonstrated using the Laser Engineered Net Shaping (LENS) metals additive manufacturing technique. As an innovative and highly localized solidification process, LENS is shown to overcome workability issues that arise during conventional thermomechanical processing, enabling the production of bulk, near net-shape forms of the Fe-Co alloy. Bulk LENS structures appeared to be ductile with no significant macroscopic defects. Atomic ordering was evaluated and significantly reduced in as-built LENS specimens relative to an annealed condition, tailorable through selection of processing parameters. Fine equiaxed grain structures were observed in as-built specimens following solidification, which then evolved toward a highly heterogeneous bimodal grain structure after annealing. The microstructure evolution in Fe-Co is discussed in the context of classical solidification theory and selective grain boundary pinning processes. In conclusion, magnetic properties were also assessed and shown to fall within the extremes of conventionally processed Hiperco® alloys.},
doi = {10.1016/j.addma.2018.02.006},
journal = {Additive Manufacturing},
number = C,
volume = 21,
place = {United States},
year = {2018},
month = {2}
}