Ternary Fe-B-C and quaternary Fe-B-C-Si amorphous alloys with glass transition and high magnetization

Hibino, Takafumi; Bitoh, Teruo

doi:10.1016/j.jallcom.2016.12.060

Cited by 32 publications

(16 citation statements)

References 14 publications

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“…The results of differential thermal analysis indicates that the primary crystals of boride are formed from the melt in the temperature range of 1498-1533 K and surrounded with boron cementite shell appeared during the peritectic transformation The findings show that the liquidus temperature for Fe-B-C system alloys is low compared to binary Fe-B and Fe-C alloys. This is in agreement with the results of other authors [12].…”

Section: Resultssupporting

confidence: 94%

Liquidus Surface and Spinodal of Fe-B-C Alloys

Filonenko

Galdina

2020

EEJP

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In this work the study is performed for the specimens of Fe-B-C alloys with boron content of 0.005–7.0 wt. % and carbon content of 0.4–6.67 wt. %, the rest is iron. According to the findings of microstructure analysis, XRD and differential thermal analyses, the primary phases and the temperatures of their formation are determined. Depending on boron content (in the range of 1.5–8.80 wt. %) and carbon content (0.5–6.67 wt. %) in the Fe-B-C alloys, the primary phases in the process of crystallization are γ-Fe, boron cementite Fe3(CB) and boride Fe2В. The outcomes of the experiment carried out in this work determine the phase composition and phase transformations occurring in the alloys and the liquidus surface is constructed. The findings show that the liquidus temperature for Fe-B-C system alloys is low compared to binary Fe-B and Fe-C alloys. At the liquidus surface of the Fe-B-C alloys, there is a point at boron content of 2.9 wt. % and carbon content of 1.3 wt. % with the lowest temperature of 1375 K and it is the point of intersection of monovariant eutectics. This fact is in a good agreement with the results of other authors. The microstructure of alloys located at the curves of monovariant eutectics is represented by the γ–Fe+Fe2B and γ–Fe+Fe3(CB) eutectics and the primary crystals of Fe2B iron boride in the shell of Fe3(BC) boron cementite. In this paper it is shown experimentally the existence of a quasi-binary section and the coordinates of the peritectic point are fixed: the boron content is 5.0 wt. %, carbon content is 3.0 wt. % and the temperature is 1515 K. The free energy of the Fe-B-C melt is calculated for the first time by the quasi-chemical method and the surface of thermodynamic stability of the Fe-B-C melt is plotted, depending on temperature and boron and carbon content in the alloy. The results obtained in the paper show that in order to obtain a homogeneous Fe-B-C melt, which does not contain any microheterogeneous structure in the form of short-order microregions, it is necessary to perform the overheating more than to 180 K for the region where the primary phase is iron, and no less than to 200 K for the regions with boron cementite and boride.

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Section: Resultssupporting

confidence: 94%

Liquidus Surface and Spinodal of Fe-B-C Alloys

Filonenko

Galdina

2020

EEJP

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“…4 (b). It was also confirmed that the thick fully amorphous specimens approximately 120 μm in thickness can be prepared in both alloys 13) .…”

Section: Quaternary Fe-b-c-si Alloyssupporting

confidence: 52%

Development of Ternary Fe-B-C and Quaternary Fe-B-C-Si Amorphous Alloys with High Glass-Forming Ability and High Magnetization

Bitoh

Hibino

Koshiba³

2018

J. Jpn. Soc. Powder Powder Metallurgy

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The various properties of the ternary Fe-B-C and quaternary Fe-B-C-Si amorphous alloys have been investigated. It was discovered that some ternary Fe-B-C amorphous alloys with the Fe content close to that of the Cr 23 C 6-type metastable Fe 23 (B, C) 6 phase exhibit a glass transition prior to crystallization on heating. The alloys with the glass transition also have high mass magnetization of 176~178 A m 2 /kg at room temperature in an as-quenched state. In addition, the glass-forming ability (GFA) of the alloys is significantly enhanced by the addition of 4 at% Si and by adjusting the composition toward the slightly lower Fe and higher B side while maintaining high magnetization of approximately 170 A m 2 /kg at room temperature in an as-quenched state. It was also confirmed that the amorphous powders of Fe-Cr-B-C-Si alloys could be produced by a conventional water atomization method and exhibit the low core losses of 305~362 kW/m 3 at 100 kHz and 100 mT. The quaternary Fe-B-C-Si amorphous alloys with high GFA, high magnetization and low core losses are suitable for a core material of various magnetic components.

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“…Hypoeutectic Fe-C-B alloy is a new wear resistance alloy and gets more and more attentions due to their low cost and high wear resistance [3,4]. Ternary Fe-C-B phase diagram shows that boron forms Fe 2 B, Fe 3 (B,C), Fe 23 (B,C) 6 , etc during solidification [5,6], and enhances hardness and wear resistance of the alloy significantly [7]. However, these boron contained hard phases display continuous network distribution along with the grain boundaries in the alloy.…”

Section: Introductionmentioning

confidence: 99%

High wear resistance hypoeutectic Fe–C–B alloy by hot rolling

2020

Mater. Res. Express

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A novel high wear resistance hypoeutectic Fe-C-B alloy by hot rolling with isolated hard lumps distributed in matrix is reported. The effect of deformation on microstructure and properties of the alloy during hot rolling process was systematically investigated. The results showed that with the increase of deformation, the continuous hard phase network in the alloy was crushed into isolated hard lumps, and the properties of the alloy were improved significantly. The alloy with 66.7% deformation displayed excellent mechanical properties with the impact value of 12.6 J while its hardness was still kept at 58.6 HRC. And the wear resistance of the alloy with 66.7% deformation was 1.21 times as that of the commercial Cr20Mo high chromium cast iron.

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Ternary Fe-B-C and quaternary Fe-B-C-Si amorphous alloys with glass transition and high magnetization

Cited by 32 publications

References 14 publications

Liquidus Surface and Spinodal of Fe-B-C Alloys

Liquidus Surface and Spinodal of Fe-B-C Alloys

Development of Ternary Fe-B-C and Quaternary Fe-B-C-Si Amorphous Alloys with High Glass-Forming Ability and High Magnetization

High wear resistance hypoeutectic Fe–C–B alloy by hot rolling

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