Effects of Solidification Cooling Rates on Microstructures and Physical Properties of Fe-6.5%Si Alloys
Abstract
Compared to the widely used Fe-3.2wt%Si steel, Fe-6.5wt%Si has superior electric and magnetic properties, including higher electrical resistivity, lower iron loss, higher permeability, and near zero magnetostriction. However, Fe-6.5wt%Si sheet is difficult to produce using traditional manufacturing processes as the high silicon content favors the formation of ordered phases that embrittle the material. Fortunately, these ordered phases can be suppressed if the alloy is cooled fast enough from a high temperature kinetically trapping the disordered solid solution or amorphous state. Planar flow casting is known for its rapid solidification rate. In order to consider it as a viable method to manufacture ductile Fe-6.5wt%Si sheets, the effect of cooling rate on physical properties of Fe-6.5wt%Si alloy are systematically investigated. In this work, various cooling rates are achieved by changing melt-spin wheel speeds, which significantly affect the solidification temperature profile and have profound effects on ordering, microstructures, textures, hardness, and magnetic properties. High cooling rates result in refined grains, reduced ordering, enhanced <100> out of the plane texture, decreased hardness, and increased coercivity. This study demonstrates a critical cooling rate at ~1.7 × 105 K/s, corresponding to a tangential wheel speed of 5-7 m/s, below which the hardness significantly increases in agreementmore »
- Authors:
-
[1];
[1];
- Ames Lab., Ames, IA (United States)
- Iowa State Univ., Ames, IA (United States)
- Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
- Publication Date:
- Research Org.:
- Ames Laboratory (AMES), Ames, IA (United States). Critical Materials Institute (CMI)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office
- OSTI Identifier:
- 1756044
- Alternate Identifier(s):
- OSTI ID: 1780304
- Report Number(s):
- IS-J-10,391
Journal ID: ISSN 1359-6454
- Grant/Contract Number:
- AC02-07CH11358; EE0007794
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 205; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Fe-6.5wt%Si; high silicon steel; soft magnetic materials; ordering; melt spinning
Citation Formats
Ouyang, Gaoyuan, Macziewski, Chad R., Jensen, Brandt, Ma, Tao, Choudhary, Renu, Dennis, Kevin, Zhou, Lin, Paudyal, Durga, Anderson, Iver, Kramer, Matthew J., and Cui, Jun. Effects of Solidification Cooling Rates on Microstructures and Physical Properties of Fe-6.5%Si Alloys. United States: N. p., 2020.
Web. doi:10.1016/j.actamat.2020.116575.
Ouyang, Gaoyuan, Macziewski, Chad R., Jensen, Brandt, Ma, Tao, Choudhary, Renu, Dennis, Kevin, Zhou, Lin, Paudyal, Durga, Anderson, Iver, Kramer, Matthew J., & Cui, Jun. Effects of Solidification Cooling Rates on Microstructures and Physical Properties of Fe-6.5%Si Alloys. United States. https://doi.org/10.1016/j.actamat.2020.116575
Ouyang, Gaoyuan, Macziewski, Chad R., Jensen, Brandt, Ma, Tao, Choudhary, Renu, Dennis, Kevin, Zhou, Lin, Paudyal, Durga, Anderson, Iver, Kramer, Matthew J., and Cui, Jun. Thu .
"Effects of Solidification Cooling Rates on Microstructures and Physical Properties of Fe-6.5%Si Alloys". United States. https://doi.org/10.1016/j.actamat.2020.116575. https://www.osti.gov/servlets/purl/1756044.
@article{osti_1756044,
title = {Effects of Solidification Cooling Rates on Microstructures and Physical Properties of Fe-6.5%Si Alloys},
author = {Ouyang, Gaoyuan and Macziewski, Chad R. and Jensen, Brandt and Ma, Tao and Choudhary, Renu and Dennis, Kevin and Zhou, Lin and Paudyal, Durga and Anderson, Iver and Kramer, Matthew J. and Cui, Jun},
abstractNote = {Compared to the widely used Fe-3.2wt%Si steel, Fe-6.5wt%Si has superior electric and magnetic properties, including higher electrical resistivity, lower iron loss, higher permeability, and near zero magnetostriction. However, Fe-6.5wt%Si sheet is difficult to produce using traditional manufacturing processes as the high silicon content favors the formation of ordered phases that embrittle the material. Fortunately, these ordered phases can be suppressed if the alloy is cooled fast enough from a high temperature kinetically trapping the disordered solid solution or amorphous state. Planar flow casting is known for its rapid solidification rate. In order to consider it as a viable method to manufacture ductile Fe-6.5wt%Si sheets, the effect of cooling rate on physical properties of Fe-6.5wt%Si alloy are systematically investigated. In this work, various cooling rates are achieved by changing melt-spin wheel speeds, which significantly affect the solidification temperature profile and have profound effects on ordering, microstructures, textures, hardness, and magnetic properties. High cooling rates result in refined grains, reduced ordering, enhanced <100> out of the plane texture, decreased hardness, and increased coercivity. This study demonstrates a critical cooling rate at ~1.7 × 105 K/s, corresponding to a tangential wheel speed of 5-7 m/s, below which the hardness significantly increases in agreement with the sudden increase of the ordered phases that causes the material embrittlement.},
doi = {10.1016/j.actamat.2020.116575},
journal = {Acta Materialia},
number = ,
volume = 205,
place = {United States},
year = {Thu Dec 17 00:00:00 EST 2020},
month = {Thu Dec 17 00:00:00 EST 2020}
}
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