Near net shape fabrication of anisotropic Fe-6.5%Si soft magnetic materials

Jensen, Brandt; Tang, Wei; Schlagel, Jordan; Hilliard, Benjamin; Pan, Chaochao; Cui, Bai; Dennis, K. W.; Jiles, David; Monson, Todd C.; Anderson, Iver E.; Kramer, M. J.; Cui, Jun

doi:10.1016/j.actamat.2020.09.084

Cited by 32 publications

(56 citation statements)

References 17 publications

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“…It indicates that the Fe-6.5wt%Si arc melting sample has good consistency, while the distribution and the growth direction of crystal grains have no obvious orientation. 24 When the magnetic properties of the steel strip samples were determined parallel to the external magnetic field (0 °C), Figure 11a shows that the Ms increased at first until 42 m/s and then decreased slightly. The Mr increases slightly from before 30 m/s compared with the arc melting sample and then decreases gradually until 46 m/s.…”

Section: Resultsmentioning

confidence: 99%

“…Rapid solidification is conducive to grain refinement and promotes homogeneous nucleation. 24 This paper addresses the effect of ultrahigh-speed cooling (30−50 m/s) on the ribbon formation and alloy solidification processes of the Fe-6.5wt%Si strip and explores the mechanical and magnetic properties of the highsilicon steel strip. The phase transition process, microstructure, fractography, magnetic property, and Vickers hardness of the samples were also confirmed and observed.…”

Section: Introductionmentioning

confidence: 99%

“…Deep undercooling and rapid cooling make the alloy melt and have a large initial nucleation undercooling degree, thereby promoting nucleation. Rapid solidification is conducive to grain refinement and promotes homogeneous nucleation . This paper addresses the effect of ultrahigh-speed cooling (30–50 m/s) on the ribbon formation and alloy solidification processes of the Fe-6.5wt%Si strip and explores the mechanical and magnetic properties of the high-silicon steel strip.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of the Fe-6.5wt%Si Strip with Rapid Cooling Coupling Deep Supercooled Solidification

Wang

Wang³

et al. 2021

ACS Omega

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The phase transition law between ordered and disordered phases, second phase reinforcement, microstructure, and mechanical properties were systematically studied in the rapid cooling coupling deep supercooled solidification process through an arc melting furnace, electromagnetic induction heating, and high-speed cooling single-roll technology. The results show that uniform nucleation and grain refinement are promoted under rapid cooling coupling deep supercooled solidification, and the phase transition from the disordered phase (A2) to the ordered phase (B2 and DO3) is also effectively suppressed. The decreased crystalline grain size and optimized microstructure morphology improved the plasticity and magnetic property. The Fe-6.5wt%Si steel strip at 42 m/s has a good phase composition of Fe (predominant), Fe2Si, and SiC. The sample showed an equiaxed ferrite crystal structure, and the saturation magnetizations were 302.5 and 356.6 emu/g in the parallel magnetic direction and the vertical magnetic direction, respectively. This phase transition behavior contributed to the exceptional magnetic property of the Fe-6.5wt%Si steel.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of the Fe-6.5wt%Si Strip with Rapid Cooling Coupling Deep Supercooled Solidification

Wang

Wang³

et al. 2021

ACS Omega

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“…98 Finally, there have been initial successes in fabricating 6.5 wt.% Si steel via melt spinning, offering an alternative to CVD. 13,99 Powder-Based Techniques Emerging powder-based techniques invariably require powder feedstock preparation, briefly discussed here. Often, mechanical alloying (MA) and/or milling steps are employed with high-quality initial alloy powders produced via water or gas atomization.…”

Section: Advances In Melt Spinningmentioning

confidence: 99%

Emerging Opportunities in Manufacturing Bulk Soft-Magnetic Alloys for Energy Applications: A Review

Kustas

Susan

Monson

2022

JOM

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Soft-magnetic alloys exhibit exceptional functional properties that are beneficial for a variety of electromagnetic applications. These alloys are conventionally manufactured into sheet or bar forms using well-established insgot metallurgy practices that involve hot- and cold-working steps. However, recent developments in process metallurgy have unlocked opportunities to directly produce bulk soft-magnetic alloys with improved, and often tailorable, structure–property relationships that are unachievable conventionally. The emergence of unconventional manufacturing routes for soft-magnetic alloys is largely motivated by the need to improve the energy efficiency of electromagnetic devices. In this review, literature that details emerging manufacturing approaches for soft-magnetic alloys is overviewed. This review covers (1) severe plastic deformation, (2) recent advances in melt spinning, (3) powder-based methods, and (4) additive manufacturing. These methods are discussed in comparison with conventional rolling and bar processing. Perspectives and recommended future research directions are also discussed.

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“…Organic polymer SMCs yielded moderate resistivity, on the order of 100 lXÁm, but typically are not thermally stable above 300 °C and have low J s , less than 1.0 T [11,12]. In other approaches, consolidated SMCs made with coatings of Al 2 O 3 , SiO 2 , or even CaF 2 on ferromagnetic powder particles reached high resistivities on the order of 100-1000 lXÁm, and moderate J s , approximately 1.0-1.5 T [13][14][15][16][17][18][19][20][21][22]. The high resistivity of Al 2 O 3 containing SMCs is attributed to the high electrical resistivity of Al 2 O 3 , on the order of 10 17 lXÁm.…”

Section: Introductionmentioning

confidence: 99%

The role of microstructural evolution during spark plasma sintering on the soft magnetic and electronic properties of a CoFe–Al2O3 soft magnetic composite

et al. 2022

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For transformers and inductors to meet the world’s growing demand for electrical power, more efficient soft magnetic materials with high saturation magnetic polarization and high electrical resistivity are needed. This work aimed at the development of a soft magnetic composite synthesized via spark plasma sintering with both high saturation magnetic polarization and high electrical resistivity for efficient soft magnetic cores. CoFe powder particles coated with an insulating layer of Al2O3 were used as feedstock material to improve the electrical resistivity while retaining high saturation magnetic polarization. By maintaining a continuous non-magnetic Al2O3 phase throughout the material, both a high saturation magnetic polarization, above 1.5 T, and high electrical resistivity, above 100 μΩ·m, were achieved. Through microstructural characterization of samples consolidated at various temperatures, the role of microstructural evolution on the magnetic and electronic properties of the composite was elucidated. Upon consolidation at relatively high temperature, the CoFe was to found plastically deform and flow into the Al2O3 phase at the particle boundaries and this phenomenon was attributed to low resistivity in the composite. In contrast, at lower consolidation temperatures, perforation of the Al2O3 phase was not observed and a high electrical resistivity was achieved, while maintaining a high magnetic polarization, ideal for more efficient soft magnetic materials for transformers and inductors.

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Near net shape fabrication of anisotropic Fe-6.5%Si soft magnetic materials

Cited by 32 publications

References 17 publications

Characterization of the Fe-6.5wt%Si Strip with Rapid Cooling Coupling Deep Supercooled Solidification

Characterization of the Fe-6.5wt%Si Strip with Rapid Cooling Coupling Deep Supercooled Solidification

Emerging Opportunities in Manufacturing Bulk Soft-Magnetic Alloys for Energy Applications: A Review

The role of microstructural evolution during spark plasma sintering on the soft magnetic and electronic properties of a CoFe–Al2O3 soft magnetic composite

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